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What does genetic drift mean?

Looking for the meaning or definition of the word genetic drift? Here's what it means.

Noun
  1. (genetics) An overall shift of allele distribution in an isolated population, due to random fluctuations in the frequencies of individual alleles of the genes.
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This, in plant species, can buffer against genetic erosion resulting from processes of endogamy and genetic drift.
This is different than the traditional effective sizes, which are descriptions of the equilibrium behavior of genetic drift in the population.
All evolutionists agree that genetic drift can't explain adaptive evolution.
The relative importance of selection and genetic drift in the evolution of duplicated genes is under debate.
The first alternative is that the long basal branches are simply the chance result of genetic drift in a large, panmictic ancestral population.
This analysis suggested that the African population is close to equilibrium between mutational forces and genetic drift.

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