Microevolution Occurs

Multiple Choice

Microevolution occurs

A) only when reproductive barriers,either pre- or post-zygotic,prevent all gene flow between two populations.
B) when species diverge.
C) when species populations undergo changes in allele frequencies over time.
D) when reproductive barriers,either pre- or post-zygotic,genetically isolate species to the point where they no longer interbreed to produce viable offspring.