Final answer:
Yes, natural selection can change allele frequencies within a population over generations.
Step-by-step explanation:
Yes, natural selection can change allele frequencies within a population over generations. When a certain allele confers a phenotype that allows an individual to have more offspring that survive and reproduce, that allele will be inherited by the next generation in greater frequency. This can lead to the increase of beneficial alleles and the decrease or elimination of detrimental alleles in the gene pool of a population over time. Examples like the changes in wing coloration in the peppered moth due to soot-covered tree trunks and the resistance alleles in mosquitoes to pesticides demonstrate the effects of natural selection on allele frequencies.