The phenomenon of fusion is likely to occur when, after a period of geographic isolation, two populations meet again and
A) their chromosomes are no longer homologous enough to permit meiosis.
B) a constant number of viable, fertile hybrids is produced over the course of generations.
C) the hybrid zone is inhospitable to hybrid survival.
D) an increasing number of viable, fertile hybrids is produced over the course of generations.
E) a decreasing number of viable, fertile hybrids is produced over the course of generations.

Question

Quizplus · Accepted Answer

The phenomenon of fusion occurs when two genetically differentiated populations come back into contact with each other after a period of geographic isolation and begin producing increasingly more viable, fertile hybrids over time. This can lead to gene flow, and eventually, complete fusion of the two populations back into a single homogeneous population with a common gene pool.

The Phenomenon of Fusion Is Likely to Occur When, After