Evolutionary Change
Allele frequencies change ? Evolution
Mutation: Random changes in DNArare, only 1 in 10,000 cell divisionsother processes usually moreimportant, but mutations remain thesource of genetic variation: basis for evolution
Nonrandom mating: self-fertilization or discrimination of genotypes in reproductione.g. if only black cats mate (BB, Bb), frequency of b will decrease; fewer white cats