Aa Aa Aa Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time. When one or more of these forces are acting in a population ...

If allele frequencies differ between the sexes ... the converse is not necessarily true. Some forms of natural selection (e.g., balancing selection, which maintains multiple alleles in a ...

Because of natural selection, different alleles are ... they were prevented from leaving the ghettos. The mutant allele increased in frequency as TB selectively felled those who did not carry ...

The Hardy-Weinberg equilibrium principle describes the unchanging frequency of alleles and ... evolutionary forces such as mutation, natural selection, or genetic drift. In the absence of these ...