BIOL 1004 Lecture Notes - Lecture 7: Genetic Variation, Population Bottleneck, Microevolution
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It always occurs but effects are more noticeable in small populations. One important effect of drift on small populations is the loss of alleles from the. Loss of alleles by drift translate into a lower than expected (hardy-weinberg) frequency. Heterozigosity is a measure of the genetic diversity of a population. Genetic variation is essential for microevolution to occur. Mutations, selection (natural, artificial or sexual), genetic drift and gene flow can cause microevolution. Hardy-weinberg principles allows to test if a locus have been evolving in a population. Microevolution is the change in the allele frequencies in a population over generations. Genetic drift: process in which chance events cause unpredictable fluctuations in allele frequencies from one generation to the next. genepool. Losing an allele, losing a raw material that represents a gene. of heterozygotes in a population. Heterozigosity: frequency of heterozygotes individuals for a given locus in a population. Heteroz(cid:455)gotes al(cid:449)a(cid:455)s goes do(cid:449)(cid:374), (cid:272)a(cid:374)"t (cid:271)e (cid:373)ore tha(cid:374) 50%.