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Two species of crickets have partially overlapping ranges.Hybrids are never found in the areas where the species meet.Individuals taken either from areas where they meet or areas where they do not meet will rarely mate in the lab because the females reject the songs sung by males of the other species.Of the few hybrids that are produced in lab crosses,all have low viability.
-The two cricket species exhibit _______ reproductive isolation and _______ a hybrid zone.
A) only prezygotic;form
B) only prezygotic;do not form
C) only postzygotic;form
D) both prezygotic and postzygotic;form
E) both prezygotic and postzygotic;do not form

Question

Quizplus · Accepted Answer

The crickets exhibit both prezygotic isolation (females rejecting songs) and postzygotic isolation (low viability of hybrids). Since hybrids are never found in the wild, they do not form a hybrid zone.

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