When populations are only partially reproductively isolated, which of the following may occur?Multiple choice question.Postzygotic isolating mechanisms will act to prevent the survival and reproduction of hybrid offspring if a zygote is formed.Even though individuals are interbreeding, prezygotic and postzygotic isolating mechanisms ensure that hybrids do not survive and reproduce.Prezygotic isolating mechanisms will act to prevent the formation of a zygote if postzygotic isolating mechanisms fail.Despite prezygotic and postzygotic isolating mechanisms, some individuals may survive and reproduce.Need help? Review these concept resources.
Question
When populations are only partially reproductively isolated, which of the following may occur?Multiple choice question.Postzygotic isolating mechanisms will act to prevent the survival and reproduction of hybrid offspring if a zygote is formed.Even though individuals are interbreeding, prezygotic and postzygotic isolating mechanisms ensure that hybrids do not survive and reproduce.Prezygotic isolating mechanisms will act to prevent the formation of a zygote if postzygotic isolating mechanisms fail.Despite prezygotic and postzygotic isolating mechanisms, some individuals may survive and reproduce.Need help? Review these concept resources.
Solution
The correct answer is: "Despite prezygotic and postzygotic isolating mechanisms, some individuals may survive and reproduce."
Here's why:
Reproductive isolation is a mechanism that keeps species from mating with others. Prezygotic isolation prevents the fertilization of eggs while postzygotic isolation prevents the formation of fertile offspring.
However, when populations are only partially reproductively isolated, it means that these mechanisms are not completely effective. Therefore, despite the existence of these mechanisms, some individuals may still be able to survive and reproduce. This can lead to gene flow between the populations and potentially, the creation of hybrid species.
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