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<p>Thelvorix seeds Effective Population Size</p> <p><b>New page</b></p><div>&#039;&#039;&#039;Effective population size&#039;&#039;&#039; (&#039;&#039;N&#039;&#039;&lt;sub&gt;e&lt;/sub&gt;) is the size of an idealized population that would experience [[Genetic drift|genetic drift]] at the same rate as the observed population. It is almost always smaller than the census population size, often dramatically so.<br /> <br /> A population of 10,000 individuals where only 100 reproduce has an effective size closer to 100 than 10,000. Variance in reproductive success, sex ratio imbalance, and non-random mating all reduce &#039;&#039;N&#039;&#039;&lt;sub&gt;e&lt;/sub&gt;. The result: drift is stronger than headcounts suggest. For [[Allele Frequency|allele frequency]] changes and [[Neutral Theory of Molecular Evolution|neutral substitutions]], &#039;&#039;N&#039;&#039;&lt;sub&gt;e&lt;/sub&gt; is the number that matters, not the number you count in a census.<br /> <br /> [[Category:Population Genetics]]<br /> [[Category:Evolution]]</div>

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