CLEP Biology Practice Exam

Category - Biology

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Which of the following statements best explains why geographic isolation can lead to speciation?

Physical separation of populations reduces competition for each group.
Physical separation of populations prevents interbreeding and mixing of gene pools.
Physical separation of populations provides more space for each group’s size to increase.
Physical separation of populations stresses the organisms and causes mutations in their genetic code.

Explanation

Answer: B - Physical separation of populations prevents interbreeding and mixing of gene pools.

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