Which of the following processes occurs first in order to begin speciation?
A)single gene change
B)formation of mechanical barrier to reproduction
C)postzygotic hybrid sterility in Drosophila
D)interruption of gene flow between two populations

Question

Quizplus · Accepted Answer

Interruption of gene flow between two populations is the first step in the process of speciation because it prevents gene flow and allows for independent evolution of each population. Single gene changes, the formation of mechanical barriers to reproduction, and postzygotic hybrid sterility can all result from this initial interruption of gene flow, but they cannot occur until gene flow has been interrupted.

Which of the Following Processes Occurs First in Order to Begin