British Land Snails Are an Example of Disruptive Selection

question 33

Multiple Choice

British land snails are an example of disruptive selection.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.The different colored snails have the opportunity to interact and breed across the British landscape.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)This will result in the formation of two species if given a long enough time.

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