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.

Question

Quizplus · Accepted Answer

Macroevolution involves the processes that lead to the emergence of new species and higher taxonomic groups with widely divergent characteristics. This often involves reproductive barriers, either pre-zygotic (before fertilization) or post-zygotic (after fertilization), that genetically isolate species. However, it's important to note that macroevolution can still occur even if there is some gene flow between populations; the key factor is that the gene flow is not sufficient to prevent the populations from diverging into distinct species.

Macroevolution Occurs