Question

In the graphs shown, which number shows a population that is most likely to create a new species?

a) 1
b) 2
c) 3
d) none of them

Answer 1

C.

Graph 3 represents diversifying (or disruptive) selection, where extreme expressions of a trait are favored. This often results in new species.

Graphs 1 and 2 represent directional selection and stabilizing selection respectively. Both of these encourage one expression of a trait rather than multiple.