An island frog population is made up of two color phenotypes, green and brown, caused by different coloration alleles. The frequency of coloration alleles is shown in the Original Population box in the diagram. Because of changes in the environment, green frogs become more visible to predators and brown frogs are better camouflaged. Part A
How many green and brown colored symbols should go into the New Population box to predict the frequency of frog coloration alleles due to the changes in the environment.

Part B

Select the evolutionary mechanism that would cause this change in allele frequency.

There may be more than one correct answer.
A
Founder effect
B
Natural selection
C
S3xual selection