CK12 Life Science

Figure7.14: Threetypesofselectioncanalterallelefrequencies, causingmicroevolution. The
effect of stabilizing selection (1) is to select for the average phenotype, reducing variation.
Disruptive selection (2) results in two different populations, which may eventually be isolated
from one another. Directional selection (3) selects for a group of individuals with a single
characteristic. ( 20 )