Biology 1001A Lecture Notes - Lecture 13: Coefficient Of Relationship, Allele Frequency, Genetic Drift
23 Mar 2014
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Document Summary
Dominance affects evolution rate and outcome: selection weeds out dominant harmful alleles, beneficial dominant alleles increase in frequency more than beneficial recessive. October 28, 2011 because recessive alleles are not expressed as much. Why is genetic variation important: very little genetic variation leads to inbreeding and reduced fitness, quantifying genetic variation, of an individual proportion of heterozygous loci, inbreeding coefficient, of a population proportion of polymorphic loci, alleles per locus. Change in allele frequencies as individuals join a population and reproduce. Random changes in allele frequencies caused by chance events. Differential survivorship or reproduction of individuals with different genotypes. Choice of mates based on their phenotypes and genotypes. Introduces new genetic variation into population (new alleles) Reduces genetic variation, especially in small populations; can eliminate alleles. One allele can replace another or allelic variation can be preserved. Does not directly affect allele frequencies, but usually prevents genetic equilibrium.
