"We were all surprised at the lack of evidence for an upward genetic drift in microsatellite repeat ... The genomes of the ancient and modern Adélie penguins sequenced in the study will provide ...

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 ...

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 ...