Two species of garter snakes (Thamnophis) are reproductively isolated because one is primarily aquatic (i.e. lives primarily in water), while the other is predominantly terrestrial (i.e. lives on land). Which reproductive isolating mechanism is demonstrated by this example? A. Ecological (habitat) B. Behavioral C. Temporal D. Gametic What is the result of reproductive isolation in general? A. Individuals of two different species can't physically mate with each other. B. The genes or alleles present in a population of one species are not able to mix with the genes or alleles present in a population of a different species. C. An offspring produced by individuals from two different species dies before reaching maturity and/or is unable to reproduce. Which of the following situations illustrates sympatry? A. A population of chipmunks lives in the same forest as a population of starlings (a bird). B. A population of chipmunks lives in a forest in south London, while a population of starlings lives in a forest in north London.
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The reproductive isolating mechanism demonstrated by the example of two species of garter snakes is ecological (habitat) isolation. This is because the two species live in different habitats (aquatic vs. terrestrial) and therefore do not come into contact with Show more…
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A population of deer is split into two by the formation of a river (from melting glaciers). Deer on one side of the river live in a forested habitat, and smaller deer have an easier time hiding from predators behind trees. Over time, the deer in this population evolve to be smaller, with short legs. On the other side of the river, deer live in an open meadow habitat and must run fast to escape predators. Over time, deer in this population become taller with long legs. Eventually, the river dries up, and the short deer and the tall deer can access one another once again. However, their height difference prevents them from being able to mate with one another (short deer can't reach the tall deer, tall deer can't bend to reach the short deer). In this example, which process has occurred? A. Sympatric speciation with pre-zygotic reproductive barrier. B. Allopatric speciation with pre-zygotic reproductive barrier. C. Allopatric speciation with post-zygotic reproductive barrier. D. Sympatric speciation with post-zygotic reproductive barrier. Which of the following are post-zygotic reproductive barriers? A. Species A and B can mate and produce healthy offspring, but the offspring are infertile. B. Different mating songs prevent mate recognition. C. Species A and B mate, but the embryos die before hatching. D. The gametes of species A aren't compatible with the gametes of species B. E. Species A breeds in Spring, Species B breeds in summer.
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