Give an example of how selection pressure has been observed to change the frequencies of alleles in population

Question

Give an example of how selection pressure has been observed to change the frequencies of alleles in population

Answer 1

There are many such cases documented in the primary literature.

For example, read up on "Maintenance of an Aminopeptidase Allele Frequency Cline by Natural Selection" here:

http://www.pnas.org/cgi/content/abstract...

or on "Allelic Frequency Change of P1 Gene in Maize Population After Recurrent Selection for Grain Yield" here:

http://crop.scijournals.org/cgi/content/...

or about "Natural selection vs. Random drift: evidence from temporal variation in allele frequencies in nature" here:

http://www.genetics.org/cgi/content/abst...