<P> Nonlethal mutations accumulate within the gene pool and increase the amount of genetic variation . The abundance of some genetic changes within the gene pool can be reduced by natural selection , while other `` more favorable '' mutations may accumulate and result in adaptive changes . </P>
<P> Nonlethal mutations accumulate within the gene pool and increase the amount of genetic variation . The abundance of some genetic changes within the gene pool can be reduced by natural selection , while other `` more favorable '' mutations may accumulate and result in adaptive changes . </P>
when do genetic changes to a population due to mutations become more common
when do genetic changes to a population due to mutations become more common
more favorable
more favorable