Which of the following is not an example of a prezygotic barrier to reproduction between two potentially separate species?
a. a race of flies raised on apple and a race of flies raised on hawthorn emerge in different seasons in response to the timing of fruit ripening.
b. eggs of chickens cannot be fertilized by the sperm of ducks.
c. the specialist pollinating wasps of fig species a are unable to access the flowers of fig species b, and vice versa
d. two closely-related species of anopheles mosquito can mate but cannot produce fertile progeny because they have different chromosome structures.
e. the courtship “waving signal” of male fiddler crabs is unique to each species so that females only respond to the mating display of males of their own species.
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