Homework Answers
Hybrids are produced when individuals from two different species mate in hybrid zones. The hybrids have abnormal number of chromosomes which do not allow viable gametes to form.
This generally happens because the diploid cells of hybrids have odd number of chromosomes, (say 63), and thus it is not able to undergo meiotic division to produce gametic cells with half the chromosomes than in diploid condition. (Half of 63 will be fraction). Thus, hybrids are not able to reproduce and are called inviable or sterile.
Reproductive barrier ensure that individuals of two different species do not interbreed and different species are isolated to keep their identify intact. Reproductive barrier can be of two types : pre-zygotic barrier and post-zygotic barrier.
Hybrids are example of post-zygotic barrier to keep the species distinct and prohibit individuals of different species from interbreeding. This keeps the two different species intact and isolated. This doesn't give rise to any third species.
For example, mating of female horse and male donkey produce a hybrid, called mule. Mule is unable to undergo reproduction and hence cannot produce its progeny. Thus, mules do not form a different species.
Hence, correct choice should be:
(C) Hybrids are born in a hybrid zone. They are unable to breed with one another to produce offspring. This would likely cause the hybrid zone to act like a reproductive barrier keeping the two original species as separate species.
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QUESTION 14 Below is a cartoon depicting various geological events, starting with one large island (panel 1) and ending with four smaller islands sequentially splitting off from each other (panels 2 to 5). Initially, there was only Species A inhabiting on the big island. However, as time went on, more species evolved on these smaller islands, such that at the current time (panel 5), there are five species. Their phylogenetic relationships are shown on the last panel. Please answer questions...
NTRODUCTION Under nearly all circumstances, postzygotic reproductive isolation cannot evolve under the direct action of natural...
NTRODUCTION
Under nearly all circumstances, postzygotic reproductive
isolation cannot evolve under the direct action of natural
selection. Instead, postzygotic isolation evolves as a by-product
of other genetic changes as proto-species diverge. In contrast,
natural selection can directly act to enhance prezygotic
reproductive isolation. Consider two species with overlapping
ranges. If hybrids between the species are less fit than pure
species individuals, females that mated with heterospecific males
would be at a selective disadvantage, because their resulting
offspring had low fitness....
Question 4 When a gene pool experiences gene flow, this means that individuals capable of reproduction...
Question 4 When a gene pool experiences gene flow, this means that individuals capable of reproduction are moving between populations O the gene pool is undergoing mutations Individuals flow out of a population to colonize a new habitat in small populations, the frequency of alleles is altered due to chance events D Question 5 Which is an example of a post-zygotic reproductive isolation? Two species of gartersnake live in the same area, but one species lives mainly in water, and...
Could someone check my answers, please? 1. Suppose that a species of fish has split into...
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Is this the correct answer? Thanks Which of the following statements is CORRECT? Select one: O...
Is this the correct answer?
Thanks
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Practice Question 03 Which one of the following statements is correct? Process costing systems use periodic...
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correct answer
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QUESTION 14 Below is a cartoon depicting various geological events, starting with one large island (panel 1) and ending with four smaller islands sequentially splitting off from each other (panels 2 to 5). Initially, there was only Species A inhabiting on the big island. However, as time went on, more species evolved on these smaller islands, such that at the current time (panel 5), there are five species. Their phylogenetic relationships are shown on the last panel. Please answer questions...
NTRODUCTION
Under nearly all circumstances, postzygotic reproductive
isolation cannot evolve under the direct action of natural
selection. Instead, postzygotic isolation evolves as a by-product
of other genetic changes as proto-species diverge. In contrast,
natural selection can directly act to enhance prezygotic
reproductive isolation. Consider two species with overlapping
ranges. If hybrids between the species are less fit than pure
species individuals, females that mated with heterospecific males
would be at a selective disadvantage, because their resulting
offspring had low fitness....
Question 4 When a gene pool experiences gene flow, this means that individuals capable of reproduction are moving between populations O the gene pool is undergoing mutations Individuals flow out of a population to colonize a new habitat in small populations, the frequency of alleles is altered due to chance events D Question 5 Which is an example of a post-zygotic reproductive isolation? Two species of gartersnake live in the same area, but one species lives mainly in water, and...
Select the CORRECT statement about factors that influence blood pressure. Select one: O a. Excess red cell production would cause a blood pressure increase. b. Systemic vasodilation would increase blood pressure, due to diversion of blood to essential areas. C. Excess albumin transport protein production would decrease blood pressure. d. An increase in cardiac output corresponds to a decrease in blood pressure, due to the increased delivery. EESTIANT
Is this the correct answer?
Thanks
Which of the following statements is CORRECT? Select one: O a. Because companies are required to follow GAAP, two firms in exactly the same operating situation will have exactly the same financial statement b. The emphasis in finance is on the determination of accounting income since the value of a firm is determined by the net income generated. O c. Even if a firm follows generally accepted accounting principles (GAAP), its reported net income...
Circle the correct answer, there may be more than one correct answer 1. Diploid Organisms: a) typically have 23 pairs of chromosomes b) are heterozygous for a trait when they carry different alleles c) carry 2 copies of chromosomes d) are homozygous for a trait when they carry different alleles 2. Why are garden peas a good subject for Mendel's experiments? a) garden peas had either or traits b) garden pess could self-pollinate to produce offspring of the same variety...
Practice Question 03 Which one of the following statements is correct? Process costing systems use periodic inventory systems. Process costing systems assign costs to departments or processes for a time period. Companies that produce many different products or services are more likely to use process costing systems. O Production is continuous when a job-order costing is used to ensure that adequate quantities are on hand. Click if you would like to Show Work for this question: Open Show Work Practice...
correct answer
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