Question

question 7 of 10
why does geographic isolation cause speciation?
a. it increases interbreeding between populations.
b. it allows two populations to evolve separately.
c. it increases gene flow between populations.
d. it causes adaptive radiation.

Explanation:

Geographic isolation separates populations. Without gene flow (interbreeding), each population adapts to its local environment. Over time, genetic differences accumulate. When these differences are significant enough (e.g., reproductive isolation), speciation occurs. Options A and C are incorrect as geographic isolation reduces interbreeding and gene flow. Option D is incorrect because adaptive radiation is a result of speciation in new environments, not the cause by geographic isolation itself. Geographic isolation's key role is enabling separate evolution (Option C).

Answer:

C. It allows two populations to evolve separately.