BIOEE 1780 Lecture Notes - Lecture 35: Heritability, Standard Deviation, Genotype
26 Nov 2016
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The probability that an allele will ultimately become fixed is exactly equal to its current frequency in the population. 2 alleles with equal frequencies (p = q = 0. 5), have an equal chance of becoming fixed (50%) The probability of ultimate fixation updates every generation. It has no memory of the frequency in previous generation. We can estimate genetic contribution to with heritability . This is the proportion of phenotypic variance that is due to genotype. Narrow sense heritability, h2 = va/ vp is the proportion of phenotypic variance that results from additive (simple) genetic variance. However, the population will evolve in response to selection only if the variation is heritable! This is the difference between the trait mean in the progeny and the trait mean of the (pre- selection) parents. The difference between the mean phenotype of the breeding individuals (selected) and the mean phenotype of the whole population. *large s means strong selection h2 = narrow-sense heritability.
