Which isolating mechanism is postzygotic?

Question

BlackTom AI · Accepted Answer

Question: Which isolating mechanism is postzygotic?

Option 1: Hybrid sterility. This is a classic example of a postzygotic isolating mechanism because it occurs after fertilization, where hybrids between species are viable but sterile and unable to produce offspring, preventing gene flow between the parental species.

Option 2: Behavioral isolation. This is a prezygotic barrier that occurs before mating, based on differences in mating calls, rituals, or courtship behaviors, reducing the likelihood that individuals from different species will mate.

Option 3: Ecological isolation. Also a prezygotic barrier, ecological isolation arises when species occupy different habitats or niches within the same area, leading to little or no contact and thus no mating.

Option 4: Mechanical isolation. This is a prezygotic barrier tied to structural incompatibilities of reproductive organs or gametes, making successful mating or fertilization physically unlikely.

Option 5: Temporal isolation. This is another prezygotic barrier, where species reproduce at different times (seasonally or daily), preventing interbreeding due to non-overlapping mating periods.

Summary of reasoning across options: Among the listed mechanisms, the term that indicates a reproductive barrier occurring after fertilization, affecting the viability or fertility of offspring rather than the mating process itself, is typically described as postzygotic. The other options describe barriers that act before or during mating, thereby preventing zygote formation rather than producing non-viable or infertile hybrids after zygote formation.

Which isolating mechanism is postzygotic?单项选择题

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