Different types of cells can have certain organelles and structures in common. Which types of cells definitely contain cell walls?
A. plant and animal cells
B. plant and eukaryotic cells
C. plant and prokaryotic cells
D. animal and eukaryotic cells
C) plant and prokaryotic cells, these are the types of cells definitely contain cell walls.prokaryotic and plant cell both have cell wall, the main role of cell wall include, which is to provide overall strength to the cell and also helps maintain the cell shape, thereby helping the cell to grow, reproduce, obtain nutrients.
The function in cell wall in plant is to protect the organelle against the harsh environment plus also helps in protecting the cell against physical damage and invading pathogens. and is made of cellulose and for bacteria is to protect it from osmotic lysis and is made of peptidoglycan.
cell wall also help in maintaining cell’s shape, protects the cell interior, and prevents the cell from bursting when it takes up water
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Which of these statements is true about the gametophyte tissue that surrounds the pine embryo?
a) It functions as a diploid food reserve.
b) It functions as a triploid food reserve.
c) It develops from the fusion of a microspore and a megaspore.
d) It functions as a haploid food reserve.
e) It is the remnant of the pollen tube.
d) it functions as a haploid food reserve
(This gametophyte tissue is a source of nourishment for the embryo.)
The following is accurate regarding the gametophyte tissue that envelops the pine embryo: (d) It serves as a haploid food reserve (The embryo receives nutrients from this gametophyte tissue.
What is gametophytic tissue?A gametophyte is one of the two alternate multicellular stages that occur during the life cycles of plants and algae. It grows from a single-chromosome haploid spore to become a haploid multicellular creature. The sexual stage of plants and algae's life cycles is known as the gametophyte. All tissues and organs produced by the haploid generation are referred to as gametophytes. The protonema and the gametophore are two separate phases in the formation of the gametophyte. The protonema is the first element of the moss to emerge from the spore.
Where is gametophyte found?Within anther sacs, the male gametophyte begins to develop inside the flower. Microsporocytes are the name for the big cells that make up their precursors and can be found in a stacked column at the middle of the anther sacs (or microspore mother cells). Microsporocytes go through meiosis to produce four microspore-like cells.
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When partial pressures for a given gas are equal between the capillaries and the tissue fluids, no net movement of that gas occurs. A)True B)False
It is untrue to say that there is no net flow of a given gas when the partial pressures for that gas are equal in the tissue fluids and capillaries.
Are gases in the arteries and veins at the same partial pressure?Gases have differing partial pressures in the arteries and veins. About 100 mmHg of partial pressure of oxygen is present in arterial blood, while only 40 mmHg is present in venous blood.
What is the process by which bodily tissues and capillaries exchange gases?Diffusion is the method through which gases are transferred between blood and body tissues. Every cell in the body receives respiratory gas through the blood.
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The most prominent organelle in a eukaryotic cell is the:_______
Answer:
The nucleus is the most conspicuous organelle found in a eukaryotic cell. It houses the cell's chromosomes.
what is the ability to move a body part through a full range of motion?
The capacity to move the joints in their whole range of motion. Flexibility refers to the capacity to move all or a portion of the body swiftly.
Flexibility refers to your ability to move your body's components across their whole range of motion. If your basketball injury has caused you to lose knee mobility, this implies you can't move it very well. Mobility frequently refers to the ability to move an injured bodily part, such as a joint or limb, but it can also apply to movement in general. relocation Add to the list Share.
Use the term relocation to indicate moving from one location to another, such as a family move that required them to leave behind old acquaintances but provided them with the opportunity to meet new people.
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in eukaryotes, atp synthase is located in the _____________
Both the internal mitochondrial membrane and the extracellular space contain eukaryotic ATP synthase. In plants, mitochondria, cellular debris, and chloroplasts all contain ATP synthase.
Where does ATP synthase reside?The ATP synthase compound is found in the inner mitochondrial membrane of eukaryotes, and the ATP production process happens on the barrier side toward the matrix compartment. The ATP-forming portion of the enzyme is also located in the inner membrane of chloroplasts in plants, with the stroma facing the enzyme.
Why do eukaryotic cells have ATP?All living creatures have the energy-carrying molecule adenosine triphosphate (ATP) in their cells. Chemical energy is generated during the breakdown of food molecules; this energy is absorbed by ATP and utilized to fuel other cellular processes.
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what would most likely happen if only one oligonucleotide primer was used in pcr? group of answer choices the primer would amplify both strands, but only produce half as much dna as if two primers were used. the primer would be unable to anneal and would not amplify any dna. the primer would be denatured by the high temperatures used to melt the dna. the primer would amplify only one strand so that double stranded dna would not be produced. the primer would amplify both dna strands, producing the same amount of dna as if two primers were used.
Option (D) is the correct answer. The primer would amplify only one strand so that double-stranded DNA would not be produced.
The polymerase chain reaction, or PCR, creates millions of copies of a particular DNA sequence using a method analogous to DNA replication that takes the use of heat-resistant bacterial equipment. Electrophoresis can then be used to view the sequence. The DNA template is duplicated via PCR and cell-based DNA replication. The polymerase chain reaction is known as PCR. Finding genetic material from a specific creature, such as a virus, is the goal of the test. If so, the test will show whether you are currently infected with a virus. When only one primer is used, the process is known as asymmetric PCR. Because only one new copy is made per cycle and only one strand of the double-stranded DNA will be amplified, exponential amplification is not conceivable.
The proper question is:
What would most likely happen if only one oligonucleotide primer was used in PCR? group of answer choices:
(A). The primer would amplify both strands, but only produce half as much DNA as if two primers were used.
(B). The primer would be unable to anneal and would not amplify any DNA.
(C). The primer would be denatured by the high temperatures used to melt the DNA.
(D). The primer would amplify only one strand so that double-stranded DNA would not be produced.
(E). The primer would amplify both DNA strands, producing the same amount of DNA as if two primers were used.
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Explain the process of fertilisation in human beings?
Fertilization is the fusion of the male and female gametes, or sperm and ovum which leads to and ovulation .During the intercourse,the sperm enters the fallopian tube, passes through the zona pellucida layer of the ovum (female egg), and combines with it to create the zygote (fertilized egg).
The process of fertilisation occurs in the following stages:
1. Sperm Capacitation- As the name suggests, is the process of getting sperm ready for fertilization. The sperm becomes more energetic and mobile. This process makes sure the sperm is in the best possible shape to fertilize the egg.
2. Sperm-Zona pellucida binding- If the sperm encounters an ovum, the process continues with sperm-zona pellucida binding. A receptor-ligand response takes place when sperm attaches to an ovum's Zona Pellucida layer. No further sperm can pass through this layer after this binding process.
3. Zona pellucida penetration - Zona pellucida penetration is made easier by the sperm's head shape, which helps it cut through the ovum's layers. It also restarts the growth of the ovum, which is stopped at one stage of meiosis and only continues once the egg has been fertilized.
4. Acrosome Reaction: Different Zona Pellucida-digesting enzymes are present in the sperm head (acrosome), aiding in the sperm's ability to penetrate further into the layers of the ovum. With deeper entry, the sperm head shrinks. Prior to fertilizing the ovum, sperm must maintain its acrosomal content.
5. Cortical Reaction: The egg is now activated because it was previously frozen at the metaphase stage of meiotic division II. The ovum develops quickly, and exocytosis and the fusion of cortical granules with Zona Pellucida occur at the same time.
6. Zona Reaction: When the Zona Pellucida layer hardens, fertilization is accomplished.
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structure x includes a deoxyribose sugar, a phosphate group, and a nitrogenous base. identify structure x?
Nucleotides, the constituent parts of DNA and RNA, make up Structure X.
What are nucleotides?DNA and RNA, the genetic components that regulate the features and operations of living things, are composed of nucleotides. A deoxyribose sugar, a phosphate group, and a nitrogenous base make up each nucleotide. The DNA molecule's backbone is made up of the five-carbon sugar deoxyribose. The negative charge that makes DNA acidic is provided by the phosphate group, a molecule composed of phosphorus and oxygen atoms. A nitrogen-containing molecule known as a nitrogenous base joins with another base to create the DNA ladder's rungs. Adenine (A), guanine (G), cytosine (C), and thymine (T) are the four nitrogenous bases found in DNA (T)
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The ribosome ______ subunit has _______ binding sites for tRNA molecules. a. large; two. b. small; two. c. large; three. d. small; three. e. large; four.
The ribosome large sub unit has three binding sites for tRNA molecules.
The correct answer is option C.
A ribosome binding point, or ribosomal list point( RBS), is a sequence of nucleotides upstream of the launch codon of an mRNA paraphrase that's responsible for the reclamation of a ribosome during the inauguration of restatement. substantially, RBS refers to bacterial sequences, although internal ribosome entry spots( IRES) have been described in mRNAs of eukaryotic cells or contagions that infect eukaryotes. Ribosome reclamation in eukaryotes is generally intermediated by the 5' cap present on eukaryotic mRNAs.
The RBS in prokaryotes is a region upstream of the launch codon. This region of the mRNA has the agreement 5'- AGGAGG- 3', also called the Shine- Dalgarno( SD) sequence. The reciprocal sequence( CCUCCU), called theanti-Shine-Dalgarno( ASD) is contained in the 3 ’ end of the 16S region of the lower( 30S) ribosomal subunit. Upon encountering the Shine- Dalgarno sequence, the ASD of the ribosome base dyads with it, after which restatement is initiated.
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onions can reproduce from bulbs. one parent bulb generates daughter bulbs with duplicate genetic information. which is the most likely advantage of this kind of reproduction?
Large quantities of individuals can be produced rapidly is the most likely advantage of this kind of reproduction.
One parent bulb can generate many daughter bulbs with identical genetic information by a process called vegetative propagation. This is a form of asexual reproduction that occurs in plants and other organisms. Vegetative propagation involves the cloning of cells from the parent bulb, which then develop into daughter bulbs. The daughter bulbs are genetically identical to the parent bulb, and they can grow into new plants. Vegetative propagation can be achieved through several methods, including division, cuttings, layering, and tissue culture.The most likely advantage of this kind of reproduction is that it ensures genetic diversity. By creating daughter bulbs with duplicate genetic information, the population of onions can maintain a larger gene pool and thus a greater ability to adapt to changing environmental conditions.
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complete question:Onions can reproduce from bulbs. One parent bulb generates daughter bulbs with duplicate genetic information. Which is the most likely advantage of this kind of reproduction?
A. Population size remains constant.
B. Beneficial mutations are inevitable.
C. Genetic variation is maximized.
D. Large quantities of individuals can be produced rapidly.
What are the two stages plants go through during their life cycle?
Answer: One is the haploid phase, also known as the gametophyte phase, and the second is the diploid phase, also known as the sporophyte phase.
Explanation:
Answer:
The vegetative stage and the reproductive stage
Explanation:
Plants typically go through two stages in their life cycle: the vegetative stage and the reproductive stage. In the vegetative stage, the plant focuses on growing leaves, stems, and roots. In the reproductive stage, the plant produces flowers, seeds, and fruit in order to reproduce.
ALLEN
why is it more appropriate to describe membranes as semifluid rather than fluid?
Within the membrane leaflet, molecules migrate laterally, and phospholipids often travel in two dimensions.
Where are the membranes?Body membranes are exceedingly particular tissue sheets that coat the surface of the body, line body cavities, and cover organs inside hollow organs. They can be separated into epithelium membranes and connective tissue membrane.
What are membranes and their function?Every cell seems to have a cell membrane, also known as a cell wall, which divides the inside milieu of the unit from the external environment. This semipermeable lipid bilayer makes up the cell membrane. Every movement of chemicals into and out of the cell is controlled by the cell membrane.
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what did hershey and chase prove was the hereditary material?
Hershey and Chase proved that DNA was the hereditary material. Through their experiments, they were able to demonstrate that the genetic material of a virus is composed of DNA and not protein.
They were able to locate the viral particles using radioactive isotopes of sulphur and phosphorus, and they discovered that the phosphorus was in the virus's nucleic acid and the sulphur was in its protein.
By doing this, they were able to demonstrate that the virus' genetic material was made up of DNA rather than protein. To confirm the veracity of their findings, they also ran a control experiment. They utilised two separate viral strains, one tagged with sulphur and the other with phosphorus.
They were able to demonstrate that DNA was the hereditary material by comparing the findings and finding that only the virus with the tagged phosphorus was transmitted to the following generation.
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Where would you expect to find Collenchyma cells?
Collenchyma cells are elongated living cells found especially around the leaves and stems of dicotyledonous plants, providing mechanical support during growth. At maturity, the cell walls are thick and usually non-lignified, and the thickening is often unevenly distributed.
What are collenchyma and their functions?Collenchyma is composed of elongated living cells with primary walls of uneven thickness containing hemicellulose, cellulose, and pectin materials. It provides support, structure, mechanical strength and flexibility to the petioles, veins and stems of young plants, allowing them to be easily bent without breaking.
Why is collenchyma known as a living cell?Collenchyma is a living tissue. Similar cells make up their structure. A strong primary cell wall of cellulose and pectin forms the sole component of the induration cells, which are often viable cells. Intercellular spaces are absent or very limited.
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A certain cell no longer needs a particular protein in its development.
How does the cell stop production of the protein?
Responses
by using vesicles to transport excess protein from the cell
by recruiting enzymes to break down any additional protein produced
by breaking down the segments of DNA containing the gene for that protein
by repressing transcription and translation of the gene for the protein
When a certain cell no longer needs a particular protein in its development, the cell stops the production of the protein by repressing transcription and translation of the gene for the protein.
The correct option is D.
What is the process of gene repression?Gene repression is the process of turning off specific genes whose byproducts are required to keep a cell functioning, such as the creation of essential cofactors or enzymes. This is crucial if the end products of these genes are short-lived, degraded, or metabolized.
Gene repression represses gene expression when the gene product such as a protein is no longer needed by the cell in its development.
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which of the heart wall layers is responsible for the heart's ability to contract? a. parietal pericardium
Answer: The heart muscle is the myocardium or middle layer of the heart walls. The myocardium is responsible for the contractile function of the cardiac pump.
Explanation:
consider the nadh formed during glycolysis. what is the final acceptor for its electrons during fermentation? what the final acceptor for its electrons during aerobic respiration?
In fermentation, the final electron acceptor for NADH (nicotinamide adenine dinucleotide) produced during glycolysis is an organic molecule such as pyruvate or lactate.
This allows the cell to generate a small amount of ATP through substrate-level phosphorylation, but does not allow for the complete oxidation of glucose to [tex]CO_{2}[/tex] and [tex]H_{2}O[/tex].
During aerobic respiration, the final electron acceptor for NADH is molecular oxygen ([tex]O_{2}[/tex]) in the electron transport chain, which is located in the inner mitochondrial membrane. Here, the electrons from NADH are transferred along a series of electron carriers and eventually reduced to water, releasing a large amount of energy in the form of ATP. This process is called oxidative phosphorylation, and it allows the cell to obtain much more energy from glucose than it could through fermentation alone.
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which of the following crop commodities is sometimes thought of as the invisible food product? group of answer choices grains sugar crops oil crops tree fruits
Oil crops. Over the previous 30 years, the increased interest has led to an 82% rise in the area under cultivation for oilseed crops and a roughly 240% increase in global production.
Oilseed crops are mostly grown for food oil. Oilseeds have gained increased attention recently due to a rise in demand for their beneficial vegetable oils, livestock feed, medicines, biofuels, and other oleochemical industrial uses. Therefore, to increase oil output per unit area, sustainable oil production must be combined with biotechnological methods in order to meet the growing global demand. Another strategy that might be used to fulfil this rising demand is the extension of oilseed growing regions. Oilseed crops can be produced sustainably through genetic engineering, and their nutritional value will be improved as well.
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3. explain how movement of an ion down its concentration gradient can establish a membrane potential.
A current is created when ions move over a membrane from a higher concentration to a lower concentration down a concentration gradient. This, however, generates a voltage across the membrane that opposes the transport of the ions.
Ions diffuse from areas of high concentration to areas of low concentration. Diffusion is an inert process. To put it another way, no energy is necessary. Ions will migrate down the concentration gradient as long as a passage exists (for example, through an open ion channel). For cells with only one permeable ionic species (only one ionic species that can cross the membrane), the resting membrane potential is equal to the equilibrium potential of that ion. The steeper the concentration gradient, the greater the potential to counteract it. Ions enter and exit cells only through membrane channels. At resting membrane potential, ions move through leak channels, which are membrane channels that remain open. Some ions move in and out of cells by active transport mechanisms such as sodium-potassium exchange pumps.
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a woman is a carrier for a sex-linked lethal gene that causes spontaneous abortions. she has nine children. how many do you expect to be boys?
This woman has three male offspring. The lethal gene resides on the X chromosome since the woman is the carrier. This indicates that there is a 50% possibility that the fatal gene would influence the progeny. As the ratio would be 2:1, there are 3 male children and 6 female children.
Alleles that cause the death of the carrying organism are referred to as lethal or deadly alleles. They frequently result from modifications to genes that are essential for growth or development. Lethal alleles can also be recessive, or dominant, or conditional, based on the genes which are involved. After a protracted period of development that appears normal, deadly alleles can be postnatally or perinatally lethal. In the event that they are embryonically fatal, the foetus won't survive past the first trimester. Alleles that are embryonically lethal are what create non-Mendelian patterns of inheritance, such as the observation of characteristics in a 2:1 ratio.
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In a leaf, you would expect to find tracheids in thea. epidermis.
b. veins
c. venules
d. arteries
In a leaf, you would expect to find tracheids in the veins (b)
Tracheids are elongated, dead cells that are located in a plant's xylem and are extremely important for transporting water. They are often located inside of the veins, which are in charge of transporting nutrients and water from the roots to the rest of the plant. The epidermis is the top layer of cells that protects the leaves and stems; venules and arteries are normally found in the circulatory systems of animals rather than in leaves.
The vascular system of plants uses veins as conduits to move water and nutrients from the roots to the rest of the plant.
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What is an alternate solution to using pesticides on beetles for natural selectionn and genetic variation
An alternate solution to using pesticides on beetles for natural selection and genetic variation is Polyculture which is also known as Companion Planting.
In this process, partner plants are planted together with crops such that it will support the crops. From a pest-control perspective, it's ideal to plant plants that naturally repel specific pests of your crop.
The replacement of hazardous pesticides can be done for natural selection and genetic variation using the alternatives which are much safer and are sustainable and cost effective. Some of them are listed below:
Integrated Pest ManagementConservation agricultureOrganic agricultureAgroecologyBiological pesticidesBiological pest controlPEATPlantixThe techniques like crop rotation, intercropping and organic pesticides can be used. Also microbes can be used for the destruction of the pests. Integrated pest management, genetic control and the natural methods are some of the other methods.
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into which two subcategories can bulk transport be divided? A. exocytosis and endocytosis B. molecules C. across a membrane
Two subcategories can bulk transport be divided are A. exocytosis and endocytosis
Two types of bulk transport systems are exocytosis and endocytosis, and they need the expenditure of energy or ATP. In the process of exocytosis, materials are generally exported out of the cell through secretory vesicles.
Hence, Bulk transport is two types firstly Exocytosis the process that involves expulsion of materials from the cell with the help of a carrier vesicle known as exocytotic vesicle. Other one is Endocytosis that is process in which the cells absorb materials such as proteins from outside by engulfing them.
Hence , A is the correct option
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The lineage that leads from the last common ancestor of chimps and humans to living humans contains all the species in the
superfamily Hominoidea
genus Astralopithecus
family Hominidae
genus Homo
tribe Homininae
The clan Homininae mixes all types of great primates that are more firmly tied with people than chimpanzees and gorillas, including the variety Homo, which has present-day people (Homo sapiens). Here option D is the correct answer.
The family Hominidae, which incorporates the clan Homininae and a few terminated genera, contains all types of extraordinary primates and their wiped-out family members.
The superfamily Hominoidea, which incorporates the family Hominidae and a few different groups of primates, envelops all types of monkeys and gorillas, including people. The variety Australopithecus, which lived in Africa somewhere in the range of quite a while back, is definitely not an immediate predecessor of present-day people, however, is viewed as a direct relation.
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What is the correct statement regarding the function of platelets?
Blood cells called platelets, sometimes known as thrombocytes, have the job of clumping and clotting blood vessel damage to halt bleeding.
Humans and other mammals, including horses, have platelets in their blood, which are tiny, colourless cell fragments. They develop in the bone marrow and are crucial to hemostasis, the process of blood clotting. When a blood artery is injured, platelets are activated and collect at the wound site to form a plug that aids in stopping the bleeding and sealing the wound. They achieve this by producing substances like thromboxane A2 and ADP, which make the blood arteries tighten and become sticky, assisting the platelets in adhering to the injured area. Platelets have a variety of different purposes in the body in addition to helping to maintain hemostasis.
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The above question is incomplete. The complete question is given below-
Which of the following statements is true regarding platelets?
a) Platelets are also called thrombocytes.
b)Platelets are tiny blood cells that help your body form clots to stop bleeding.
c)Platelets are a component of blood.
d)All of the above.
What condition is a mushroom like growth from the surface of a mucous membrane?
Pendunculated polyps are tissue growths that resemble mushrooms and are attached to the mucous membrane of the colon by a long, thin stalk.
Polyps are microscopic, scaly, or mushroom-shaped growths that develop in the mucosa or right next to it. Inflammatory polyps, lymphoid polyps, and fibroepithelial polyps are only a few of the various varieties. The sore is known as a deep tissue injury when it's not an open wound present but the tissues underneath have been harmed (DTI). There might be a blood-filled blister or a region of skin that appears dark red or purple. Vesicles with a diameter more than 0.5 cm are called bullae. Bullae's thin walls make them prone to rupture. Bullae are large blisters that develop from second-degree burns.
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an ecologist estimated 800 star-nosed moles, condylura cristata, per square mile in one woodlot and 1,600 per square mile in another woodlot. what was the ecologist comparing?
An ecologist estimated that in one woodlot there were 1,600 star-nosed moles (Condylura cristata) while in another there were 800. Ecologists compared the star-nosed mole population density.
What is the star-nosed mole dental formula?In dentistry, I 3/3, C 1/1, P 4/4, and M 3/3 equal 44. (Figure 1). The eyes are small and partially hidden in the pelage, and the pinnae are missing. Dense, silky, and velvety, the pelage is primarily blackish-brown to black dorsally and just little paler ventrally.
What is the star-nosed mole's range?A star-nosed mole of average size measures 19 mm (7.6 in) in length and weighs 50 g. (1.8 oz). Range and environment: Southeast Manitoba to Labrador make up the range Southeast Georgia, south and east to Nova Scotia.
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why is it logical to observe that wind-pollinated species usually grow in dense stands containing many individuals of the same species?
Wind-pollinated plants require dense stands of the same species to thrive thus it is logical for them to grow in dense quantities as the vast majority of it does not find an appropriate ovule.
Many of our most common plant species, such as grasses, conifers, and food plants like wheat, rice, and corn, are pollinated by wind.
The wind, which came into existence before insects and creates tiny, inconspicuous flowers, physically transports pollen. However, wind pollination has several disadvantages as well: These plants produce a lot of pollen, but the vast majority of it does not find an appropriate ovule. Unpredictable wind speed and direction. In order to survive, wind-pollinated plants typically need dense stands of the same species.
Early insects that subsequently evolved over millions of years into the bees and other pollinators we see today consumed some of this wind-borne pollen. Plants adapted alongside these pollinators, resulting in large, showy flowers that are now entirely dependent on animal pollination.
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What is the probability that both heterozygous parents will contribute a recessive allele for any given trait?
The probability of inheriting the recessive trait from both parents is 25% .
According to the product rule when two alleles independently assort the probability of them occurring together is calculated by each of the probability.
Since each allele is a 1/2 chance of 50% probability to be in inherited from either parent is 1/2*1/2=1/4 or 25%
There is a 50% x 50% = 25% chance that both of the offspring's alleles are dominant. There is a 50% x 50% = 25% chance that both of the offspring's alleles are recessive.
This is due to the fact that for a recessive phenotype to be expressed, two recessive alleles must be present (bb). A homozygous dominant child would have a 25% probability of being born, whereas a heterozygous child would have a 50% chance of being born.
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