Reinforcement is most likely to occur when ________.
A) the environment is changing
B) hybrids have lower fitness than either parent population
C) prezygotic isolating mechanisms are in place
D) gene flow is low

Question

Quizplus · Accepted Answer

Reinforcement occurs when natural selection favors traits that prevent interbreeding between two populations, ultimately leading to the development of separate species. Hybrids with lower fitness than either parent population provide strong selection pressure against interbreeding, promoting the reinforcement of prezygotic isolation mechanisms. Thus, choice B is the best answer. Option A is not related to reinforcement, and neither is choice C. Gene flow being low can facilitate reinforcement, but it is not a requirement for it to occur, and the statement is incomplete.

Reinforcement Is Most Likely to Occur When ________