Macroevolution Occurs

Multiple Choice

Macroevolution occurs

A) only when reproductive barriers,either pre- or post-zygotic,prevent all gene flow between two populations.
B) when reproductive barriers,either pre- or post-zygotic,genetically isolate species,even in the presence of some gene flow between two populations.
C) when species populations undergo changes in allele frequencies over time.
D) when species morphology from genetic change causes their physical similarity to drift apart.