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 ...

For instance, mutations disrupt the equilibrium of allele frequencies by introducing new alleles into a population. Similarly, natural selection and nonrandom mating disrupt the Hardy-Weinberg ...

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 ...

Other than traits known to be strongly influenced by natural selection, there is little information on how allele frequencies change over time in natural populations. The multiyear, genome-wide ...

Natural selection, on the other hand ... so long as there are differences in allele frequencies among those groups, will create evolutionary change. Because allele frequencies vary among human ...

The overall theme of the research in my lab is detecting the effects of natural selection on nuclear genes ... Adaptation to global warming in enzyme allele frequencies: In the 1970s and 1980s, the ...

A new paper in Molecular Biology and Evolution argues that the allele frequency differences are a function of positive directional selection since humans left Africa ~100,000 years ago. The impact of ...

But before the team could find evidence of natural selection, they first had to rule out allele frequency shifts stemming from genetic drift: random changes in allelic frequency that are more ...

Later simulations showed that natural selection likely drove these allele frequency changes. "I think this study shows that we can focus on these same families of genes in looking at immunity in ...

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 ...