AP BIOLOGY

Detailed explanation-1: -Some examples of gene flow include: Bees pollinating flowers and moving genetic material between populations. Humans moving between populations through migration. Captive salmon escape and breed with wild salmon.

Detailed explanation-2: -Still other finches have medium-size beaks that can catch and grasp insects. Because they are isolated, the birds don’t breed with one another and have therefore developed into unique species with unique characteristics. This is called allopatric speciation.

Detailed explanation-3: -From this one migrant species would come many–at least 13 species of finch evolving from the single ancestor. This process in which one species gives rise to multiple species that exploit different niches is called adaptive radiation.

Detailed explanation-4: -We show that Darwin’s finches on a Galapagos island underwent two evolutionary changes after a severe El Nino event caused changes in their food supply. Small beak sizes were selectively favoured in one granivorous species when large seeds became scarce.