Answer: a
Explanation:
The designation "group A," used to help classify Streptococcus pyogenes, refers to this bacterium's
A) Lancefield antigen.
B) hemolysis pattern.
C) M protein.
D) type of streptokinase produced.
E) disease associations.
The A) Lancefield antigen is an important characteristic of Streptococcus pyogenes and is used to classify this bacterium into the group A streptococci.
The designation "group A" is used to classify Streptococcus pyogenes based on the presence of Lancefield group A antigen in its cell wall. Lancefield antigens are carbohydrate antigens found on the surface of many different bacterial species, and they are used to classify bacteria into different groups based on their antigenic properties.
Streptococcus pyogenes is a Gram-positive bacterium that causes a wide range of diseases, including strep throat, impetigo, and necrotizing fasciitis. It is one of the most common bacterial pathogens in humans.
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as helicase unwinds the dna molecule, the separated strands are kept apart by dna polymerase. T/F
False. As helicase unwinds the DNA molecule, the separated strands are not kept apart by DNA polymerase. Instead, single-strand binding proteins (SSBs) keep the separated strands apart, while DNA polymerase is responsible for synthesizing new DNA strands complementary to the separated strands.
A DNA polymerase is a member of a family of enzymes that facilitates the synthesis of DNA molecules from nucleoside triphosphates, the chemical building blocks of DNA. The majority of the time, these enzymes function in groups to split a single original DNA duplex into two identical DNA duplexes, which is a necessary step in DNA replication. As big molecules comprised of recurring, smaller units that are chemically linked to one another, polymers, such as nucleic acids, are a type of molecule.
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what do SDS Page and agarose gel have in common
SDS-PAGE (Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis) and agarose gel electrophoresis are both widely used techniques in molecular biology and biochemistry for separating and analyzing biomolecules based on their size and charge.
Both methods employ the principle of electrophoresis, where an electric field is applied to move charged molecules through a gel matrix. While SDS-PAGE is commonly used for the separation of proteins, agarose gel electrophoresis is utilized for DNA and RNA separation.
Both techniques involve the migration of molecules through a gel matrix, with the separation based on differences in size and charge, making them valuable tools for molecular analysis and characterization.
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the process by which accumulated adaptations result in superficially similar animals derived from different stock is called .
The process by which accumulated adaptations result in superficially similar animals derived from different stock is called convergent evolution.
Convergent evolution is a biological phenomenon where different species, which are not closely related, independently evolve similar traits or adaptations in response to similar environmental pressures. These adaptations may include physical or behavioral characteristics that enable the organisms to survive and thrive in their respective environments. Although the organisms may have different ancestral origins, convergent evolution results in them sharing similar features that allow them to perform similar functions. For example, wings have evolved independently in birds, bats, and insects, all of which use them for flight, despite having different underlying anatomical structures.
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what comprises the portal vein? what is its job? what are some complications seen with it and what were the primary causes? normal waveform?
The portal vein is a blood vessel that is responsible for carrying nutrient-rich blood from the gastrointestinal tract to the liver. It is formed by the union of the superior mesenteric vein and the splenic vein. The portal vein plays a crucial role in the digestive system by delivering nutrients to the liver for processing and storage.
Complications associated with the portal vein include portal hypertension, which occurs when there is an increase in blood pressure within the portal vein. This can lead to the development of varices, which are swollen veins in the esophagus, stomach, or intestines. Other complications include portal vein thrombosis, which occurs when a blood clot blocks the flow of blood in the portal vein, and portal vein stenosis, which is a narrowing of the portal vein.
In summary, the portal vein is an important blood vessel that plays a crucial role in delivering nutrients to the liver. Complications associated with the portal vein can include portal hypertension, varices, portal vein thrombosis, and portal vein stenosis. The primary causes of these complications can vary, but can include liver disease, cirrhosis, and blood clotting disorders. A normal waveform for the portal vein would show continuous flow of blood with low velocity and low resistance index.
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you find that a newly developed drug binds to dopamine receptors but does not activate them. based on this information you classify the drug as a(n)
The drug can be classified as a dopamine receptor antagonist. An antagonist is a substance that binds to a receptor but does not activate it
which is what is happening in this case. Dopamine is a neurotransmitter that plays a role in regulating mood, motivation, and reward, among other things. Dopamine receptors are proteins found on the surface of certain cells that are activated by dopamine. When dopamine binds to its receptors, it can either activate or inhibit cellular responses.
In the case of the newly developed drug, it binds to dopamine receptors but does not activate them. This means that it is not acting like dopamine itself, which would activate the receptors. Instead, it is blocking the receptors from being activated by dopamine. Therefore, the drug can be classified as a dopamine receptor antagonist.
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bonobos, which belong to the same genus as chimpanzees, are exceptional among primates because of
Bonobos are exceptional among primates because of their unique social structure, cooperative behavior, and strong inclination towards peaceful conflict resolution.
Bonobos (Pan paniscus) belong to the same genus as chimpanzees (Pan troglodytes), but they exhibit different behaviors and social structures. Bonobos live in matriarchal societies, where females hold significant power and influence. They are known for their cooperative and peaceful behavior, with a strong emphasis on maintaining social harmony.
This is achieved through grooming, sharing resources, and engaging in various forms of non-aggressive physical contact. Furthermore, bonobos resolve conflicts and establish bonds through sexual behaviors, which are used for both reproductive and non-reproductive purposes. Overall, bonobos stand out among primates due to their unique social dynamics and inclination towards peaceful interactions.
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Many cells store lipids in droplets of varying sizes. These droplets ...
A. are enclosed by a phospholipid monolayer (instead of a bilayer).
B. mostly store cholesterol and phospholipids.
C. are produced by and released from the Golgi apparatus.
D. have mostly protein-free bilayer membranes.
E. are composed primarily of charged amphiphilic lipids.
Many cells store lipids in droplets of varying sizes that are enclosed by a phospholipid monolayer (option A).
Lipid droplets are generally spherical or ellipsoid-shaped objects with diameters between 0.1 and several micrometers. They consist of a neutral lipid core, primarily made up of triglycerides and cholesterol esters, that is encircled by a monolayer of phospholipids. Amphipathic molecules with a hydrophilic head and a hydrophobic tail, such phospholipids, make up the monolayer. The phospholipid bilayer that makes up the plasma membrane of cells is distinct from this monolayer.
A complex network of proteins and enzymes forms and controls the dynamic organelles known as lipid droplets. They are created in the endoplasmic reticulum and then moved to the cytoplasm, where they are eventually used. Additionally, proteins are crucial in controlling how lipid droplets are created, develop, and degrade. Several kinds of proteins, such as structural proteins that support the monolayer and enzymes that speed up the production and degradation of lipids, are connected to lipid droplets.
In conclusion, lipid droplets are dynamic organelles made up of a phospholipid monolayer encasing a neutral lipid core. They play a significant role in energy storage and metabolism in cells and are generated and controlled by a complex network of proteins and enzymes.
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in thick skin, what is the thickest (most cell layers) stratum of the epidermis?
In thick skin, the stratum corneum is the thickest layer of the epidermis, with up to 30 layers of dead, flattened cells that make up the outermost layer of skin.
This layer is responsible for providing a protective barrier against environmental factors and preventing excessive water loss from the skin. Additionally, the content loaded in thick skin includes sweat glands, hair follicles, and sebaceous glands, which are absent in thin skin. The epidermis' topmost layer, the stratum corneum, is where keratinocyte development and maturation come to an end. The proliferative keratinocytes that make up the basal layer of the epidermis gradually lose this ability as the cells grow up the epidermis and experience programmed death.
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Which of the following does not belong to the second line of defense?
A. The macrophage system
B. Natural killer cells
C. Inflammation
D. The gastric juices
E. Interferon and the complement system
The answer is D. The gastric juices. The second line of defense refers to the non-specific immune responses that occur after the first line of defense (such as physical barriers) has been breached.
The macrophage system, natural killer cells, inflammation, interferon and the complement system are all components of the second line of defense, but the gastric juices belong to the first line of defense as they act as a physical barrier and help prevent the entry of pathogens into the body. Hydrochloric acid (HCl), lipase, and pepsin come together specifically in gastric juice. Its primary purpose is to render ingested bacteria inactive, preventing infectious pathogens from entering the intestine.
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The largest known shield volcano in the solar system is Olympus Mons (extinct) on Mars. Based on what we know about shield volcanoes on Earth, how would you describe Olympus Mons’ lava in terms of mineralogy, viscosity, and temperature?
Olympus Mons, the largest known shield volcano in the solar system located on Mars, would likely have lava with a basaltic mineralogy, low viscosity, and high temperature, similar to shield volcanoes on Earth.
Shield volcanoes on Earth, such as Mauna Loa in Hawaii, are characterized by their low-profile, broad shape, and effusive eruptions. They are primarily composed of basaltic lava, which is rich in iron, magnesium, and calcium minerals. Similarly, Olympus Mons is believed to have formed from basaltic lava flows, indicating a similar mineralogy.
The lava erupted by shield volcanoes on Earth, including basaltic lava, has relatively low viscosity compared to other types of lava. This low viscosity allows the lava to flow easily and spread out in thin, broad sheets, contributing to the gentle slopes and large size of shield volcanoes. Therefore, the lava erupted by Olympus Mons would likely have low viscosity, allowing it to cover vast areas and contribute to the volcano's massive size.
The temperature of shield volcano lava varies, but it is generally high. Basaltic lava typically erupts at temperatures ranging from 1,100 to 1,200 degrees Celsius (2,000 to 2,200 degrees Fahrenheit). Given that Olympus Mons is a large shield volcano, it is reasonable to infer that its lava would also have been erupted at high temperatures, contributing to its extensive lava flows and the formation of its vast shield shape.
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which vibrational mode for carbon dioxide is not expected to contribute to the greenhouse effect?
The symmetric stretch vibrational mode for carbon dioxide is not expected to contribute to the greenhouse effect.
Carbon dioxide is a greenhouse gas that contributes to global warming by trapping heat in the Earth's atmosphere. This is primarily due to the molecule's ability to absorb infrared radiation, which leads to the warming effect. The vibrational modes of carbon dioxide are responsible for its ability to absorb this radiation.
The asymmetric stretch and bending modes are the most effective in absorbing infrared radiation and contributing to the greenhouse effect. However, the symmetric stretch mode is not expected to contribute significantly to the greenhouse effect because it does not produce a dipole moment change and, therefore, does not absorb infrared radiation efficiently. Thus, the symmetric stretch mode for carbon dioxide is not a significant contributor to the greenhouse effect.
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the cochlea, semicircular canals, and vestibular sacs make up the _____ ear.
The cochlea, semicircular canals, and vestibular sacs make up the inner ear.
The inner ear is one of the three major divisions of the human ear, along with the outer ear and middle ear. It is responsible for both hearing and balance.The cochlea is a spiral-shaped, fluid-filled structure within the inner ear that plays a crucial role in hearing. It contains specialized sensory cells called hair cells that convert sound vibrations into electrical signals, which are then transmitted to the brain for interpretation. The semicircular canals, also located in the inner ear, are responsible for detecting rotational movements of the head and contribute to our sense of balance. They contain fluid and hair cells that detect changes in the flow of the fluid as we move. The vestibular sacs, which consist of the utricle and saccule, are also part of the inner ear and play a role in sensing linear acceleration and head position relative to gravity.
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most of the cells examined during interval a have half as much dna as those measured in interval c. therefore, most of the cells at interval b must have been in:
Most of the cells at interval B must have been in the process of replicating their DNA.
The statement indicates that cells examined during interval A have half as much DNA as those measured in interval C. This suggests that interval A represents cells in the G1 (Gap 1) phase of the cell cycle, where cells have a diploid amount of DNA. Interval C, on the other hand, represents cells in the G2 (Gap 2) phase, where cells have undergone DNA replication and now have a doubled amount of DNA. Since interval B lies between intervals A and C, cells at interval B are likely in the S (Synthesis) phase of the cell cycle, where DNA replication occurs. During this phase, cells are actively synthesizing and duplicating their DNA, resulting in an intermediate amount of DNA between that of cells in the G1 and G2 phases.
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one of the concerns with the human genome project is that once your genetic structure is known:
One of the concerns with the human genome project is that once your genetic structure is known, it could potentially be used against you in a discriminatory manner, such as denial of insurance coverage or employment opportunities.
Another concern is the potential misuse of genetic information for eugenics or to create designer babies. Additionally, there are concerns about privacy and the possibility of genetic information being leaked. The ethical implications of genetic testing and the use of genetic information are complex and require careful consideration and regulation to ensure that individuals' rights and privacy are protected, and that the technology is used for the benefit of humanity.
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can you identify which mechanism of evolution is at work in each scenario shown below? a. gene flow
b. natural selection
c. natural selection
d. genetic drift
e. natural selection
The mechanism of evolution at work in scenario (a) is **gene flow**. Gene flow refers to the movement of genetic material from one population to another through the migration of individuals or the transfer of gametes.
In this scenario, if individuals from one population migrate to another and successfully reproduce, they can introduce new genetic variations to the recipient population. This gene flow can result in changes in allele frequencies and contribute to the evolution of the population.
The mechanism of evolution at work in scenario (b) is **natural selection**.
Natural selection is a fundamental mechanism of evolution where individuals with certain heritable traits are more likely to survive and reproduce, passing those advantageous traits to future generations. In this scenario, certain traits provide a selective advantage, allowing individuals possessing those traits to have higher survival and reproductive success compared to others. Over time, this leads to the increase in frequency of the advantageous traits within the population.
The mechanism of evolution at work in scenario (c) is **natural selection**.
Similar to the previous scenario, natural selection is at work. The key concept behind natural selection is that individuals with traits better suited to their environment have higher chances of survival and reproduction. In this scenario, certain traits provide a selective advantage, enabling individuals possessing those traits to outcompete others and have increased reproductive success. Consequently, the frequency of the advantageous traits within the population will tend to increase over time.
The mechanism of evolution at work in scenario (d) is **genetic drift**.
Genetic drift refers to the random fluctuations in allele frequencies within a population due to chance events. In this scenario, genetic drift is at play because the change in allele frequencies is not driven by selection or migration but rather by random sampling of individuals for reproduction. The small population size increases the impact of genetic drift, as chance events can have a more significant influence on allele frequencies, potentially leading to the loss or fixation of certain alleles over time.
The mechanism of evolution at work in scenario (e) is **natural selection**.
Once again, natural selection is the mechanism of evolution in this scenario. It is evident when certain traits provide a selective advantage, leading to differential survival and reproductive success. Individuals with advantageous traits are better suited to their environment and, as a result, have increased chances of surviving and passing on those traits to the next generation. Over time, the frequency of the advantageous traits will increase within the population through the process of natural selection.
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Decomposers are important in the environment because they
Explanation:
Decomposers are important in the environment because they break down dead organic matter and recycle nutrients back into the ecosystem. When plants and animals die, decomposers such as bacteria, fungi, and some insects break down their remains into simpler substances. This process releases nutrients such as nitrogen, phosphorus, and carbon back into the soil, which can then be taken up by other living organisms such as plants. Without decomposers, dead organic matter would accumulate and nutrients would become locked up, making them unavailable for other organisms to use. This would eventually lead to a decline in the health and diversity of the ecosystem. Decomposers play a critical role in maintaining the balance of the ecosystem by recycling nutrients and helping to sustain life.
Decomposers are important in the environment because they = help to break down and recycle organic matter, returning nutrients to the soil and making them available to other living organisms.
whose body morphology will lead to the most heat loss at a given cold temperature?
The body morphology that would lead to the most heat loss at a given cold temperature would be one with a large surface area-to-volume ratio. This is because the larger surface area would result in more heat being lost through convection and radiation. Therefore, a person with a thin, tall, and lean body type would experience the most heat loss at a given cold temperature.
Body morphology plays a significant role in heat loss at a given cold temperature. Among different body shapes, individuals with a larger surface area to volume ratio will experience the most heat loss. This is because a larger surface area allows for more heat to be exchanged with the surrounding environment, leading to greater heat loss. In contrast, individuals with a smaller surface area to volume ratio, such as those with a more compact or stocky body shape, will lose heat more slowly, helping them retain warmth more effectively in cold temperatures.
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Help me I need the answer please
If high frequency sound waves (ultrasound) are used to lower the temperature of the dry regenerated air stream needed to remove water from the silica gel, it will use less energy to dehumidify a space. As a result the dehumidifier will be more energy efficient, and its operating cost will be cheaper.
The users of the dehumidifier will benefit from it in many ways. Since the dehumidifier uses less energy to run, they will spend less on their energy bills. Since it will use less energy, the carbon footprint of the dehumidifier will be lower. The dehumidifier will be more efficient as it can dehumidify the cooler environment and extract more moisture from the air at a lower temperature.
So, the correct option is A.
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The two main types of pollution are:
ozone
particulates
poisonous gases
radiation
which statement about energy is true? responses energy can always be recycled. energy can always be recycled. energy only flows in one direction through an ecosystem. energy only flows in one direction through an ecosystem. energy transfer between trophic levels is efficient. energy transfer between trophic levels is efficient. once an energy source is gone it cannot be renewed.
Answer:
energy flows in only one direction through an ecosystem.
Explanation:
which plants that grow here do people use as medicinal plants?
Answer:
American beautyberry.
Eastern Red Cedar.
Elderberry.
Giant Reed.
Greenbriar.
Honey Locust.
Osage-Orange.
Palmetto.
Explanation:
if you randomly removed a somatic cell from the human body, odds are that it would ________.
If you randomly removed a somatic cell from the human body, odds are that it would be diploid.
Diploid cells contain two sets of chromosomes, one set inherited from each parent, and are the most common type of somatic cell in the human body. Examples of diploid cells include skin cells, muscle cells, and most other cells in the body, except for reproductive cells. In contrast, haploid cells contain only one set of chromosomes and are found in the reproductive organs of the body. Haploid cells are produced during meiosis, a specialized form of cell division that results in the formation of gametes (sperm or eggs) for sexual reproduction. While there are some exceptions, such as certain types of cancer cells that have abnormal chromosome numbers, the majority of somatic cells in the human body are diploid. This is because diploid cells are better equipped to carry out the functions required for normal bodily processes, such as cell division and tissue repair.
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the ribs articulate with the _______ anteriorly via a common tissue structure known as the _______.
The ribs articulate with the sternum anteriorly via a common tissue structure known as the costal cartilage.
The costal cartilage is a hyaline cartilage that connects the anterior end of the ribs to the sternum. The first seven pairs of ribs articulate directly with the sternum via their own costal cartilage, while the eighth, ninth, and tenth pairs articulate with the cartilage of the rib above them.
The eleventh and twelfth pairs of ribs, known as floating ribs, do not have any anterior attachment to the sternum. The costal cartilage not only serves as a structural support for the ribcage but also allows for some flexibility and movement during breathing. Injury or inflammation of the costal cartilage can lead to chest pain, difficulty breathing, and discomfort when coughing or sneezing.
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______ is/are found in the ventricles, and attach the flaps of the AV valves to papillary muscle.
Select one:
a. Moderator band
b. Trabeculae carneae
c. Chordae tendineae
d. Pectinate muscles
Chordae tendineae are found in the ventricles and attach the flaps of the AV valves to papillary muscles. The answer is c.
Chordae tendineae are specialized fibrous cords found in the ventricles of the heart. They connect the flaps (or cusps) of the atrioventricular (AV) valves (specifically, the mitral valve and the tricuspid valve) to the papillary muscles. The papillary muscles are small muscular projections within the ventricles.
The main function of chordae tendineae is to anchor and stabilize the AV valve flaps during ventricular contraction (systole). When the ventricles contract, the papillary muscles also contract, exerting tension on the chordae tendineae.
This tension prevents the AV valve flaps from prolapsing (bulging back into the atria) and ensures proper closure of the valves, preventing the backflow of blood. Hence, c. is the answer.
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Why don’t urine mix with semen?
Because they leave the body by various paths and come from different areas of the body, urine, and semen don't usually mingle.
The kidneys create urine, which then passes via the ureters and is deposited in the bladder. The urethra, which is a distinct tube from the reproductive system, is where pee is released from the body when you urinate.
Contrarily, semen is created in the testicles and moves throughout the reproductive system. During sexual activity, it combines with fluids from the prostate gland and seminal vesicles to make semen, which is subsequently expelled by the urethra.
The internal urethral sphincter, a group of muscles located at the base of the bladder, closes off the passageway between the bladder and the urethra during ejaculation to stop urine from mixing with semen. With the help of this mechanism, semen is kept free from urine-related contaminates.
Even though it is theoretically possible for very minute amounts of pee to mix with semen if there is still urine in the urethra prior to ejaculation, the volumes are normally very minimal and it has no impact on the semen's general makeup or function.
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T/F when dna is loosely packed and found in the nucleus in long strings, it is called a chromosome.
True, when dna is loosely packed and found in the nucleus in long strings, it is called a chromosome.
When DNA is loosely packed and found in the nucleus in long strings, it is called chromatin. However, when the chromatin condenses and coils tightly, it forms a chromosome.
The DNA in our cells is organized into structures called chromosomes. Chromosomes are made up of DNA molecules that are wrapped around proteins called histones. When the DNA is loosely packed and found in the nucleus in long strings, it is called chromatin. The chromatin is organized into regions that are more or less tightly packed. The less tightly packed regions are called euchromatin, and the more tightly packed regions are called heterochromatin. When the chromatin condenses and coils tightly, it forms a chromosome. Chromosomes are visible under a microscope during cell division, when they become even more tightly packed.
In summary, when DNA is loosely packed and found in the nucleus in long strings, it is called chromatin. When the chromatin condenses and coils tightly, it forms a chromosome. Therefore, the statement "when DNA is loosely packed and found in the nucleus in long strings, it is called a chromosome" is false, and the correct statement is that it is called chromatin.
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maximum sustainable yield group of answer choices occurs closer to carrying capacity refers to the maximum number of individuals you can harvest without getting diminishing returns the next harvest is when there are few individuals left to reproduce using the largest hook size
The term "maximum sustainable yield" refers to the maximum number of individuals of a particular species that can be harvested without causing long-term damage to the population or ecosystem.
This group of answer choices occurs closer to the carrying capacity, which is the maximum number of individuals of a species that a particular ecosystem can support over the long term.
In order to achieve maximum sustainable yield, it is important to harvest using the appropriate methods and at the appropriate times. Harvesting too many individuals too quickly can lead to a decline in the population, which can have negative consequences for the ecosystem as a whole.
Maximum sustainable yield is the maximum number of individuals that can be harvested from a population without causing long-term damage to the ecosystem. This group of answer choices occurs closer to the carrying capacity of the ecosystem, which is the maximum number of individuals that can be supported over the long term. To achieve maximum sustainable yield, it is important to harvest using appropriate methods and at appropriate times. Harvesting too many individuals too quickly can lead to a decline in the population, which can have negative consequences for the ecosystem as a whole.
Maximum sustainable yield is an important concept in sustainable resource management. It is important to harvest resources in a way that ensures the long-term health of the ecosystem. By using appropriate methods and timing, it is possible to achieve maximum sustainable yield and ensure that resources are available for future generations.
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which population would be most likely to survive and evolve with a change in the selective environment? choose one: a. a small population with low genetic diversity b. a large population with low genetic diversity c. a small population with high genetic diversity d. a large population with high genetic diversity
A small population with high genetic diversity would be most likely to survive and evolve with a change in the selective environment.
This is because high genetic diversity provides more variations and adaptations that can be selected for in changing conditions. In a small population with low genetic diversity, there is a higher risk of inbreeding and genetic drift, which can decrease the chances of survival and adaptation. In a large population with low genetic diversity, there may not be enough genetic variation to respond to changing conditions. On the other hand, a small population with high genetic diversity can benefit from having more genetic variation that can potentially lead to advantageous traits, while a large population with high genetic diversity already has a large pool of genetic variation that can respond to selective pressures.
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describe how one part of mendel's conclusion is consistent with the current scientific knowledge of inheritance
One part of Mendel's conclusion that is consistent with current scientific knowledge of inheritance is his law of segregation. According to this law, during the formation of gametes (sex cells), the alleles (alternative forms of a gene) for a trait separate from each other so that each gamete receives only one allele.
Mendel's experiments with pea plants showed that when he crossed purebred plants with different traits (such as tall and short), the first generation (F1) offspring were all tall. However, in the second generation (F2) offspring resulting from crossing the F1 plants, both tall and short plants appeared in a predictable ratio of approximately 3:1. This observation aligns with our current understanding of inheritance and the behavior of genes. We now know that alleles exist in pairs, with one inherited from each parent. During meiosis, the process of gamete formation, the alleles segregate or separate, randomly assigning one allele to each gamete. This process is consistent with Mendel's law of segregation. Additionally, Mendel's law of segregation supports the concept of dominant and recessive alleles. The tall trait in Mendel's experiments was dominant, while the short trait was recessive. This concept remains valid in modern genetics, where dominant alleles are expressed in the phenotype, while recessive alleles are only expressed in the absence of a dominant allele.
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