22.4

Question 1

gene flow can counter speciation

Answer 1

reinforcement does not always result in speciation

Question 2

adaptation can lead to selection

Answer 2

adaptive change in mating signals can result from selective forces in new environments leading to reproductive isolation

Question 3

random changes may cause reproductive isolation

Answer 3

genetic drift, founder effects, and population bottlenecks may lead to reproductive isolation

Question 4

allopatric speciation and geographic isolation

Answer 4

populations can become geographically isolated for a variety of reasons