Retrieving "Allele Fixation" from the archives

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1. Genetic Drift

   Linked via "fixation"

   Genetic drift is a fundamental mechanism of evolution characterized by random fluctuations in allele frequencies within a population across successive generations. Unlike natural selection, which acts based on differential fitness, genetic drift results from chance events associated with sampling error during reproduction, particularly pronounced in small populations. Its effects are stochastic and dir…

2. Genetic Drift

   Linked via "fixation"

   | Allele Frequency Fluctuation | High variance ($\sigma^2{\Delta p}$ large) | Low variance ($\sigma^2{\Delta p}$ small) | Random fluctuation |
   | Genetic Diversity | Rapid loss | Maintained (if selection is neutral) | Loss of heterozygosity |
   | Fixation Time | Short ($\approx 4N$) | Long ($\approx 4N$) | Random fixation or loss |
   | Selection Efficacy | Weakly deleterious/advantageous alleles can fix | Weak selection is consistently effective | [Evo…