Rank the following isolating mechanisms with respect to their time of occurrence in the life cycle, from earliest to latest.
A) Low hybrid zygotic viability, gametic isolation, low hybrid adult viability
B) Low hybrid zygotic viability, low hybrid adult viability, gametic isolation
C) Low hybrid adult viability, low hybrid zygotic viability, gametic isolation
D) Gametic isolation, low hybrid zygotic viability, low hybrid adult viability
E) Gametic isolation, low hybrid adult viability, low hybrid zygotic viability

Question

Quizplus · Accepted Answer

Gametic isolation occurs earliest in the life cycle, as it prevents successful fertilization before the development of a hybrid zygote. Low hybrid zygotic viability occurs after fertilization and the formation of a hybrid zygote, but before adulthood. Low hybrid adult viability occurs latest in the life cycle, as it affects the survival and reproduction of the hybrid individual after maturation. Therefore, the correct ranking is: Gametic isolation > Low hybrid zygotic viability > Low hybrid adult viability. Choice D is the only option with this ranking.

Rank the Following Isolating Mechanisms with Respect to Their Time