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 ...

Most strategies that are used to detect whether natural selection has affected a specific allele measure the departure of the allele's frequency from expectations under a neutral model.

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 ...

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 ...

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 ...

It can be easy, amid all that change, to assume that we’ve conquered biology and eliminated the effects of evolution and natural selection ... variant (a.k.a. “allele”) frequency in a ...

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 ...

“We found a significant increase in the frequency of this allele in their offspring, evidence that natural selection favours reduced armour in freshwater,” says Barrett. Barrett and Rogers ...

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 ...