Disruptive selection is described in the text with the case of British land snails.In the grassy fields,the light-banded snails escape bird predators.In the darker forest,the dark snails survive and the light-banded snails are eaten.As long as the snails continue to cruise across the British landscape mating at the same season and having access to each other,why doesn't this "disruptive selection" eventually lead to two separate species?
A)There is no reproductive isolation to prevent gene flow.
B)They are already two separate species and the intermediate forms are hybrids.
C)The color forms are probably not genetically determined.
D)There must be some unknown factor producing an equal stabilizing selection "to hold the species together."
E)This will result in the formation of two species if given long enough time.

Question

Quizplus · Accepted Answer

Without reproductive isolation to prevent gene flow, the two color forms of the snail will continue to mate with each other, preventing the formation of two separate species.

Disruptive Selection Is Described in the Text with the Case