ANTH 337 Chapter Notes - Chapter 5: Quantitative Trait Locus, Allele Frequency, Genetic Correlation
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Continuous variation from discrete inheritance: codominant. Heterozygote is halfway between the two homozygotes: hardy weinberg equilibrium. If we assume that two alleles have equal frequency in a population, then the expected proportions of genotypes are . 25 aa:0. 5 aa:0. 25aa. If two loci are independent, then the two locus genotype probabilities are the products of the individual locus genotypic probabilities. Classic theorem from probability theory and statistics. If the number of loci that contribute to a trait is large enough, then the distribution of genetic values will tend toward a normal curve. The average of squared values around the average value. The variance is due to the sum of the individual genetic values across all loci. Environment has a smoothing effect on the distribution: additive genetic effects are referred to as polygenetic effects. They represent the sum of independent effects across many independent loci.
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