The next few questions refer to the following description.
On the Bahamian island of Andros, mosquitofish populations live in various, now-isolated, freshwater ponds that were once united. Currently, some predator-rich ponds have mosquitofish that can swim in short, fast bursts; other predator-poor ponds have mosquitofish that can swim continuously for a long time. When placed together in the same body of water, the two kinds of female mosquitofish exhibit exclusive breeding preferences.
-Which two of the following have operated to increase divergence between mosquitofish populations on Andros?
1)improved gene flow
2)bottleneck effect
3)sexual selection
4)founder effect
5)natural selection
A) 1 and 3
B) 2 and 3
C) 2 and 4
D) 3 and 4
E) 3 and 5

Question

Quizplus · Accepted Answer

Sexual selection and natural selection have likely operated to increase divergence between mosquitofish populations on Andros. Sexual selection has led to exclusive breeding preferences based on swimming abilities in predator-rich versus predator-poor ponds, while natural selection has likely favored the development of different swimming abilities in response to different predation pressures. The other choices (improved gene flow, bottleneck effect, and founder effect) are not supported by the description and do not contribute to population divergence in this specific case.

The Next Few Questions Refer to the Following Description