Biology 1201A Lecture Notes - Lecture 5: Allele Frequency, Population Genetics, Genotype Frequency
14 Mar 2016
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Populaion always refer to individuals of the same species with the ability to interact and interbreed. Frequency of recessive, dominant or any alleles are roughly constant: true if no outside features (ie: forces) inluencing allele frequencies. Recessive alleles aren"t necessarily in low frequency in a populaion. Allele frequencies can be used to predict genotype frequencies: again assuming that there"s no outside forces inluencing them. Hwe what we predict a populaion to look like if there"s nothing interesing going on. This is a null hypothesis what we expect when there"s nothing interesing going on: we know that all these things don"t happen. Let p be the frequency of one allele (a1) Let q be the frequency of the other allele (a2) Q squared is homozygous for a2 (a2 x a2) 2pq is heterozygous for a1 a2: its 2 ime pq because there"s two ways to get that heterozygote. A populaion of catle is composed of 50 red, 64 roan, 34 white.
