The H5N1 avian influenza virus is mutating to evade immune defenses in mammals following prior infection or vaccination.

The founder effect is an extreme example of "genetic drift." Genes occurring at a certain frequency in the larger population will occur at a different frequency -- more or less often -- in a ...

As Gautschi et al. explain, genetic drift, arguably the most powerful evolutionary force at work in small populations, results from the random sampling of alleles from one generation to the next ...

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 ...

The COVID virus is a crafty thing ... only had small genetic changes from their predecessors (called genetic drift). However, JN.1 was unusual in that it was 41 mutations away from XBB.1.5 ...

According to this hypothesis, most of the changes in DNA inside individuals are the result of "genetic drift" -- random changes that go on all the time and aren't steered by natural selection in ...