Multiple Choice
Which of the following is an example of a postzygotic reproductive isolation mechanism?
22. Evolutionary Genetics
Speciation
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When two populations of the same species no longer interbreed, what is the most likely result?
A
They may undergo speciation and become separate species.
B
They will immediately go extinct.
C
They will continue to exchange genetic material freely.
D
They will merge back into a single population.
Verified step by step guidance1
Understand the concept of reproductive isolation, which occurs when two populations of the same species no longer interbreed.
Recognize that reproductive isolation prevents gene flow between the populations, meaning they no longer exchange genetic material.
Consider the evolutionary consequences of this isolation: without gene flow, genetic differences can accumulate over time due to mutation, natural selection, and genetic drift.
Realize that as these genetic differences build up, the two populations may diverge enough to become distinct species, a process known as speciation.
Conclude that the most likely result of two populations no longer interbreeding is that they may undergo speciation and become separate species.
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