In the southeastern U.S.,two species of wild lettuce (Lactuca)do not usually form hybrids,because they bloom at different seasons.The means of isolation appears to be
A)postzygotic and behavioral.
B)prezygotic and temporal.
C)prezygotic and geographical.
D)prezygotic and mechanical.
E)postzygotic and ecological.

Question

Quizplus · Accepted Answer

The fact that the two species of wild lettuce (Lactuca) do not usually form hybrids because they bloom at different seasons suggests that their means of isolation is prezygotic (preventing the formation of zygotes) and temporal (related to timing). Therefore, option B is the best choice.

In the Southeastern U