The centromere of a chromosome is the round center of the chromosome.
Chromosomes are fine threads made of protein and one DNA molecule that can absorb color. Chromosomes are diploid cells that contain genetic information that can be passed on to their offspring. Human chromosomes consist of 46 chromosomes or 23 pairs of chromosomes.
The chromome has a structure consisting of centromeres, chromatids, telomeres, chromomeres and satellites. The centromere is the central part of the chromosome which is usually round in shape and functions at the time of division through the kinetochore which causes the spindle thread to attach to each opposite pole.
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What type of cell junction connects the cytoplasm of two adjacent cells to facilitate molecule exchange?.
Gap junctions, which connect the cytoplasm of adjacent cells, are crucial for signaling.
They are intercellular junctions. Structures called desmosomes are designed for the transmission of force and cell-to-cell attachment. Gap junctions' analogue in plant cells, plasmodesmata, are routes for transport and communication.
Gap junctions are specialized junctions that enable very quick cell-to-cell communication. They make this possible. Ions can move between nearby cells at these junctions because they connect their cytoplasms.
By allowing tiny molecules to move straight from one cell's cytoplasm to that of another, these junctions enable communication between nearby cells.
There are many different types of animal cells, and these connections between cells are known as gap junctions. Two cells' cytoplasms are directly connected by them.
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With each cell cycle, two cells form from one cell. In three hours, how many cells could form from one frog egg cell?.
64 cells have been produced from one frog egg cell after 3 hours.
Do human eggs just contain one cell?Nevertheless, the egg is a single cell when it is placed down by the female; after being fertilized by the single cell or nucleus of the male sperm, the egg still exists as a single cell but now possesses a complete set of chromosomes and DNA.
The frog cell divides once every 30 minutes. The following amount of divisions takes place in 3 hours:
30 minutes =one division.
3 *60-seconds =1/30*180.
=6 divisions,
After n divisions, the number of cells that result can be calculated using = 2^n
where n is the total number of cycles of division.
After six cell division cycles, there are 2^6 cells.
There are 64 cells total.
64 cells have been produced from one frog egg cell after 3 hours.
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There are two types of nucleic acids, DNA and RNA. Nearly all organisms use DNA, not RNA, as the central repository for genetic information.
Choose the statements that explain this phenomenon.
DNA contains adenine as one of its nitrogenous bases.
DNA has a double‑stranded structure that ensures an accurate mechanism of duplication.
DNA contains an −OH−OH group at the 2′2′ carbon.
DNA is flexible and forms complex catalytic structures.
DNA is more resistant against enzymes that break down nucleic acids.
DNA is more resistant against enzymes that break down nucleic acids.
DNA has a double‑stranded structure that ensures an accurate mechanism of duplication.
What is meant by mechanism?
the method or technique by which a result is brought about or a goal is achieved. Machinery or general mechanical devices. the layout or arrangement of components in a machine, comparable equipment, or something similar. Any mechanical device, or the mechanical component of something: the clock's mechanism.A mechanism is a component of a machine that consists of two or more parts that are arranged so that the movement of one piece compels the motion of the others. Typically employed to Change your movement's direction. Alter the movement style.The body's organ systems run consistently in a certain way. The processes by which the body's organ systems operate are frequently referred to as "physiological mechanisms."To learn more about mechanism refer to
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Help stuck on this one question
to be honest I think it's the answer A
Why don t digestive enzymes digest the stomach and small intestine?.
Enzymes have a great difficulty to break down the living protein chains that line your mouth, stomach, and intestines. Because the living protein chains are tightly wrapped, enzymes cannot get into contact with them.
Although the proteins are broken down into smaller amino acid chains by the digestive enzymes released in the mouth and stomach, the amino acid chains are still too long for the cells lining the small intestine to absorb. These chains are disassembled into individual amino acids that can be absorbed by the intestines by peptidase enzymes secreted by the intestinal glands.
The mucosal epithelial barrier serves as one of the primary defenses against intestinal autodigestion. With the help of this barrier, the intestine's contents, such as digestive enzymes, are kept from seeping into the intestine's wall.
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Stem cell research is an emotional topic. Although the advancements in dna technology are remarkable, there are many arguments for and against stem cell research. Which is an argument against stem cell research?.
The study of stem cells is a sensitive subject. Fetuses and a mother's eggs are exploited in stem cell research.
Because obtaining the stem cells results in the destruction of the blastocyst, an un-implanted human embryo during the sixth to eighth day of development, opponents claim that the research is unethical. The federal government should not endorse "the taking of innocent human life," as Bush said when he vetoed the stem cell measure last year. The ethics of stem cell research remain the main issue of discussion. And same ethics applies to stem cell research that is still in the embryonic stage. Using stem cells to generate organs for transplantation and research, as well as to treat patients with diseases that are currently incurable, holds immense promise. However, its use raises clinical, moral, and social problems. These problems will vary depending on whether adult, embryonic, or therapeutically cloned stem cells are grown and transplanted.
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complete question: Stem cell research is an emotional topic. Although the advancements in DNA technology are remarkable, there are many arguments for and against stem cell research. Which is an argument against stem cell research?
A)Stem cell research exploits fetuses and a mother's eggs. B)Stem cell research could lead to the regeneration of skin for burn victims. C)Researchers could use embryonic stem cells to find the cure to many different disorders and illnesses. Eliminate D)Stem cell research could lead to the regeneration of nerve cells and tissues to aid spinal cord injured patients.
Matter is moved through the earth by the interaction of earth’s systems.truefalse
The statement 'Matter is moved through the earth by the interaction of earth’s systems' is true as matter is moved by air and water.
Matter is in constant motion on earth due to the interaction of earth’s systems.
This movement is driven by the circulation of air and water, the force of gravity and the movement of the earth’s plates.
Through these processes, matter is moved between the atmosphere, hydrosphere, lithosphere and biosphere.
This movement of matter is a key component of the Earth system, allowing for the distribution of resources and energy across the planet. Without this motion, life as we know it wouldn’t be possible.
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how does one side of the dna strand compare with the other side of the dna strand?
DNA is the fundamental building block of life, and the double-stranded structure of DNA is the basis for its function.
One side of the DNA strand contains a nucleotide sequence that is complementary to the nucleotide sequence on the other side of the strand.
This complementary pairing of nucleotides is essential for DNA replication and transcription, as it allows a single strand of DNA to be copied and passed on to new cells.
The nucleotides on each side of the DNA strand are held together by hydrogen bonds, which are formed between the nitrogenous bases that make up the nucleotides.
This complementary pairing of nucleotides is what makes DNA so unique, and is the basis for its function in cells.
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Water is essential to life. which property of water affects life less than the others?
One property of water that affects life less than the others is its high heat capacity. This means that water can absorb a large amount of heat energy before its temperature changes, which allows organisms to maintain a relatively stable internal temperature. This property of water is important for maintaining the homeostasis of living organisms, but it is not essential for life in the same way that other properties of water, such as its ability to dissolve many substances, its ability to act as a solvent, and its ability to maintain a liquid state at temperatures that are common on Earth are.
What color is reflected off a leaf?.
The color that reflected off a leaf is green.
Plants and leaves appear green because a "special pair" of chlorophyll molecules uses the red end of the visible light spectrum to power reactions within each cell. We see the unused green light that is reflected from the leaf. Photosynthesis' chemical reactions convert carbon dioxide from the air into sugars to feed the plant, and as a byproduct, the plant produces oxygen.
Because it does not absorb green wavelengths of white light, chlorophyll gives plants their green color. Because that specific light wavelength is reflected by the plant, it appears green.
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What is the importance of crossing over and independent assortment in meiosis and justify how it affects variation in organisms?.
Meiosis increases genetic diversity Each gamete has a unique DNA set because of recombination and independent assortment during meiosis. The resultant zygote has a special set of genes as a result.
A overview of recombination (crossing over) in meiosis, which occurs during gamete creation, and the Law of Independent Assortment. When homologous chromosomes are joined together during meiosis, certain spots along each pair make contact with the other pair.
When compared to previously unidentified gene combinations, the consequences of independent assortment during meiosis lead to the creation of a large quantity of variety. Only when two genes are linked together or shared by the same chromosome can it occur. Additionally, it is unclear how maternal and paternal homologous chromosomes will be distributed among gametes.
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where does the right atrium pump blood when it contracts
Right atrium of the heart is where blood enters first. Blood is forced through the tricuspid valve and into the right ventricle by a muscular contraction.
A heart chamber, the right ventricle is one of the four. Low-oxygen blood is sent to the lungs by the right ventricle. The oxygen is then "refilled" in the lungs for the blood. When seen in the cardiac short axis plane, the right ventricle is positioned to the left of the right atrium and has a form resembling a semilunar shell that wraps around the left ventricle's anteromedial aspect (LV). Compared to the left ventricle, it has thinner walls because the right side of the heart is under less pressure. The heart's anterior and inferior boundaries are almost entirely formed by it.
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Dichloro-diphenyl-trichloroethane, commonly called DDT, was a widely used pesticide in the United States from 1943 to the 1970s. By 1972, increasing awareness of the harmful effects on human health and wildlife resulted in the pesticide being banned from use in the United States. However, the environmental impact of DDT did not end when the ban was put into effect. Due to its chemical properties, DDT is known to remain in soil and animal tissues for 2–15 years and can pollute aquatic ecosystems for up to 150 years. Food contamination through all levels of the food chain continues to be a focus of research. The image shows the concentration of DDT found at the different trophic levels in ecosystems impacted by the pesticide.
Circular graphic showing the concentration of DDT at the different trophic levels. Algae show 0.04 ppm, zooplankton shows 0.23 ppm, small fish show 2.07 ppm, large fish show 7.36 ppm, and humans show 13.55 ppm.
Based on the information provided, what predictions can be made about the impacts of DDT on the ecosystem?
Humans and animals at the top of the food chain would suffer the greatest impact because the pesticide builds up at each tropic level, increasing the toxicity.
Aquatic producers at the base on the food chain would suffer the greatest impact because the pesticide can remain in aquatic systems for long periods.
Land mammals at the top of food chain would suffer the least impact because the pesticide remains in soil for a short amount of time.
Small fish in the middle of the food chain would suffer the least impact because the pesticide has not built up enough to harm them in any way.
Based on the information provided, the predictions which can be made about the impacts of DDT on the ecosystem is that Humans and animals at the top of the food chain would suffer the greatest impact because the pesticide builds up at each tropic level, increasing the toxicity and is denoted as option A.
What is Pesticide?This is referred to as substances that are meant to control pests and they contain toxic chemicals whicbh is why thry have to be carefully used to avoid impacting the ecosystem negatively.
From the information we can deduce that the pesticide builds up at each trophic level which is why humans show 13.55 ppm and is therefore why Humans and animals at the top of the food chain would suffer the greatest impact.
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Answer:
Humans and animals at the top of the food chain would suffer the greatest impact because the pesticide builds up at each tropic level, increasing the toxicity.
Explanation:
Because the number of pesticides over there is the greatest, so meaning that it will suffer the most.
Also took the test and got it right.
I promise it is right!!!! Just make the answers and questions are the same and u got it!!!!!!!!! ;)
in mitosis, are the parent cells haploid or diploid?
In contrast to meiosis, which creates four haploid (n) gametes that are genetically distinct from one another and the original parent (germ) cell, mitosis creates two diploid (2n) somatic cells that are genetically identical to one another and the original parent cell.
A cell of an organism is said to be haploid if it only contains one set of chromosomes. Only the egg and sperm cells are haploid in humans. The initiating cell for cell division in mitosis is a parent cell. Due to the fact that they produce daughter cells, progeny cells are also known as parent cells. Parent cells in the body can be of various cell types. Consider bone marrow stem cells.To know more about Mitosis here
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What is oxygen indirect effects on other species in the food chain
Answer:
Reactive oxygen species directly interact with DNA, proteins and lipids and destroy them through oxidation process causing cell death (direct effect). High concentration of ROS damage structure and function of mitochondria and change the redox state of the cell interior (indirect effect).
Explanation:
what are hormones ? give their characterstics and functions
Answer:
Hormones are chemical messengers produced by the endocrine glands that travel through the bloodstream to regulate various physiological processes in the body. They are responsible for a wide range of functions, including growth and development, metabolism, sexual function, and mood.
-Characteristics of hormones:Hormones are chemical substancesThey are produced by endocrine glandsThey are secreted into the bloodstreamThey travel to specific target cells or tissuesThey affect the activity of those cells or tissues-Functions of hormones:Control of metabolismGrowth and developmentSexual function and reproductionMood regulationHeart rate and blood pressure regulationImmune system regulationStress responseHunger and thirst regulationSleep and wake cyclesBody temperature regulationHope this helps!Keep Learning!<3
a change in the relative frequencies of alleles in the gene pool of a population is called
Any change in allele frequencies in a gene pool is called genetic drift. Hence, genetic drift is correct.
The change in the frequency of alleles in the population is due to random reasons. It may reduce the genetic variation or cause gene variants to disappear completely. There are two main types of genetic drift population bottlenecks and the founder effect. Severe reduction in small population size, recurring population, and when the population starts from a small number of organisms are three main causes of genetic drift. It is different from a mutation which causes a slow change in the genes variant, while genetic drift eliminates genetic variants.
Any change in allele frequencies in a gene pool is called genetic drift. Hence, genetic drift is correct.
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What are Darwin's 3 main ideas of natural selection?.
Darwin's 3 main ideas of natural selection that inevitably lead to natural selection: most qualities are inherited, more offspring are generated than can survive, and kids with more advantageous traits will endure and create more offspring than those with less advantageous traits.
Darwin claimed that three laws that govern nature resulted in natural selection. First, although the exact mechanism by which qualities are inherited was unknown, most properties of organisms are inherited, or passed from parent to child. Second, there are more children born than can survive. All creatures have a higher capability for reproduction than there are resources to sustain their population. As a result, each generation faces competition for those resources. Thomas Malthus, an economist, wrote an essay in which he examined this idea in respect to human populations, which had an impact on both Darwin and Wallace.
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What is the probability of purple flowers offspring if purple flowers are dominant to white flowers?.
There is a 75% chance of having purple-flowered children. Given that the predominate flower colour in this instance is purple, P will stand for that colour, while p will stand for white.
Therefore, the alleles Pp will be used to represent the heterozygous genotype of the purple flower plant.
According to Mendel's law of segregation, the genotype of the offspring will be PP, Pp,Pp,pp when two heterozygous plants are crossed.
When two plants have purple flowers, this indicates that the dominant colour is purple and the recessive colour is white. The findings of the cross show that there is a 75% chance that the progeny will have purple flowers.
As a result, the phenotypic ratio of the offspring's purple- to white-flowered flowers will be 3:1. Therefore, 75% of the progeny will be purple.
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what part do the stamen and the ovule play in plant reproduction?
The stamen is considered as male reproductive organ of a plant and the ovule is a female reproductive part of a plant.
In general , Stamens are considered as the male reproductive organs of flowering plants. They comprises of an anther, which is a site for pollen development, and in most of species they are present like a stalk filament, that helps to transmits water and nutrients on the site of anther and positions it to aid pollen dispersal.
on the other hand , ovule are female reproductive parts that plays a crucial role in flower reproduction. It is also an organ within the plant that helps to produces egg cells. After process of fertilization, the ovule becomes the fruit, seed, or seeds of the plant.
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An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid: water, apple juice, or milk. What variables should be kept constant/controlled?.
Water, apple juice, or milk are the varied liquids that are provided to each plant. The type of plant, music, and sunshine should all be kept steady or under control.
The various liquids in this experiment serve as the independent variable. The independent variable is the one that remains constant during the course of the experiment. The independent variable is the one that remains constant during the course of the experiment. In contrast, the dependent variable is the one that will be measured or examined during the experiment (in this case, plant growth). The variable that is anticipated to "cause" a change in the dependent variable is referred to as the independent variable.
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complete question: An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, what are the controlled variables?
What type of
cycle is the
water cycle
grouped as?
A. a biogeochemical cycle
C. a biochemical cycle
USGS
The Water Cycle
B. a biological cycle
D. a chemical cycle
Answer:
water cycle
Explanation:
Another name for a convex lens is a converging lens. Converging means…
A. Brings light into focus (beams come together)
B. Spreads light our or focus (beams spread apart)
Answer:
A
Explanation:
Answer:
A. Brings light into focus (beams come together)
Explanation:
Converging lens or convex lens is a type of lens on which parallel rays of light after refraction converge or meet at the focus of the lens.
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What might have happened to the color-blind allele in the Pingelapee population following the typhoon if Mwanenied had had no children?
If he had never given birth, there would be a significant decline in population and nearly no one would be color blind.
The population has changed since color blindness is a symptom of inbreeding, and because of its tiny size and secluded location, achromatopsia is more common.
Achromatopsia is a rare, bilateral inherited retinal degeneration affecting all three types of cone photoreceptor cells that results in reduced visual acuity, photophobia, hemeralopia, and severe loss of color discrimination.Only the genotype frequencies, not the allelic frequencies, are altered by inbreeding.
Inbreeding, which is typically the outcome of mating related individuals, is defined as the probability that two alleles in an individual are identical by ancestry.
Red-green color vision abnormalities are brought on by genetic alterations involving the OPN1LW or OPN1MW genes. Defects in blue-yellow color vision are caused by OPN1SW gene mutations.
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What might have happened to the color-blind allele in the Pingelapese population following the typhoon if Mwanenised had had no children? Has the Pingelapese population evolved? Explain. (Hint: Does inbreeding cause a change in allele frequencies?)
Write a brief explanation for the results in the table using information about phenotypes and genotypes in blood group genes.
An individual's genotype is determined by their unique DNA pattern. This phrase refers more directly to the two alleles a person has for a certain gene.
This genotype, or phenotype, manifests itself in a patient's clinical presentation. The genotype has a significant influence on the phenotypes in blood group systems. A phenotype is a trait that can be seen in an organism that is influenced by its genotype, environment, or both. For instance, the ABO blood type system depends on specific antigens being present on the surface of blood cells. A and B are codominant alleles in this system, whereas O is a recessive allele that does not express itself in heterozygous people.
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Aide from activity level, the amount of food that i __________ by omeone can affect their weight. What one word complete the entence?
An individual's weight can be influenced by their food intake and degree of activity.
What impact does degree of exercise have on dietary preferences?According to an intriguing new study on exercise and eating, getting active may change how we feel about food in unexpected and positive ways. According to the study, beginning exercisers start to feel less of an appetite for unhealthy meals, which is a change that might have long-term effects on weight management.
How do your actions and the food you eat interact?The risk of physical health issues like diabetes and heart disease is lowered by eating healthfully. It benefits your general health as well as your sleep and energy patterns. You might have observed that your mood frequently influences the foods you eat.
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Q3-Non disjunction during meiosis of oogenesis will result in eggs that have.
a-The normal number of chromosomes
B-one less than the normal number of chromosomes
b-one too many chromosomes
d. both B and C correct
Option - d. both B and C are correct. During meiosis of oogenesis, non-disjunction can occur when the chromosomes do not separate properly during cell division.
This can result in eggs that have either one less than the normal number of chromosomes (monosomy) or one too many chromosomes (trisomy).
For example, if non-disjunction occurs during meiosis I, an egg may receive an extra copy of a particular chromosome, resulting in three copies of that chromosome (trisomy), or in the other hand, an egg may not receive a copy of a particular chromosome, resulting in one less than the normal number of chromosomes (monosomy).
Meiosis is a type of cell division that occurs in sexually reproducing organisms, such as plants and animals. It results in the formation of haploid cells, which have half the number of chromosomes as the original cell (known as a diploid cell).
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Biomolecules are essential organic molecules which are involved in the maintenance and metabolic processes of living organisms. Biomolecules include carbohydrates, lipids, proteins, and nucleic acids. These vary in composition, structure, and function. Select 3 choices that correctly pairs the biomolecule and one of its functions.
The options B, C, and D accurately match the biomolecule to one of its functions.
Biomolecules are crucial chemical compounds that support metabolic processes in living things. Among these biomolecules are: The primary biomolecule responsible for generating and replacing cells in the body is called protein. The body's primary energy source is carbohydrate. Lipids: These substances also give the body energy. It makes up the majority of the membrane lipids in the cell membrane. The genetic makeup of the organism is stored in nucleic acid. As a result, choices A and E are incorrect. This is due to the fact that proteins are body builders rather than energy stores. Instead of serving as chemical messengers, nucleic acids serve to preserve an organism's genetic makeup.
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complete question: Biomolecules are essential organic molecules which are involved in the maintenance and metabolic processes of living organisms. Biomolecules include carbohydrates, lipids, proteins, and nucleic acids. These vary in composition, structure and function. Select ALL of the choices that correctly pairs the biomolecule and one of its functions.
A) proteins: store energy
B) carbohydrates: make up plant cell walls
C) nucleic acids: store genetic information
D) Lipids: compose part of the cell membrane
E) nucleic acids: chemical messengers (hormones)
In what phase does the following event occur? A new nuclear membrane forms around the chromosomes.
A nucleolus emerges in each new nucleus, the spindle vanishes, and a nuclear membrane reforms around each set of chromosomes during the telophase.
What do you mean by telophase?A eukaryotic cell's telophase is the last phase of both meiosis and mitosis. The disintegration of the nucleolus and nuclear membrane that occurs during prophase and prometaphase is reversed during telophase. The nucleoli return, a nuclear envelope is reassembled around each set of chromatids, and chromosomes start to decondense back into the extended chromatin that was present during interphase as they reach the cell poles. The residual spindle microtubules are depolymerized after the mitotic spindle has been destroyed. Approximately 2% of the cell cycle's time is spent in telophase. When cytokinesis is complete, the two daughter nuclei are divided into two distinct daughter cells. Cytokinesis normally starts before late telophase. Dephosphorylation of mitotic cyclin-dependent kinase (Cdk) substrates is the main cause of telophase.
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while doing a pedigree analysis of a european royal family, you notice a disease in a female child of two healthy parents. there are also some cousins with the same genetic disease. If this disease is controlled by a single gene, then the most likely explanation for these observations is the disease is
only seen in heterozygous individuals such as the daughter.
recessive and only seen in homozygous recessive individuals such as the daughter. dominant and is seen in homozygous dominant or heterozygous individuals. dominant and only seen in homozygous dominant individuals such as the daughter. a spontaneous mutation.
Only homozygous recessive people, like the daughter, are affected by the disease, which is recessive.
In this case, a single gene is responsible for the sickness; if Mendel's principles of inheritance are followed, the trait will either be dominant or recessive. However, in this instance, the parents of the affected girl and the other two affected cousins are all in good health. In order to increase their chances of having a child with the disorders, like this child, the two parents need be heterozygous for this trait (Rr). To sum up, this illness is recessive and only manifests in homozygous recessive people, like the daughter. An autosomal disorder is Tay-Sachs. This means that other chromosomes in the body, other the sex chromosomes, contain the variant gene or allele responsible for the illness. Its inheritance is hence autosomal recessive. Evidently no one will have this disease, thus there is no chance.
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