# Handout11 - Lecture 11 Migration and NonRandom Mating Migration Movement of breeding animals from one population to another Examples exportation of

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1 Lecture 11 Migration and Non- Random Mating Migration Movement of breeding animals from one population to another Examples-- exportation of U.S. Holstein genes -- Florida Panther Migration population A population B N A animal f(t) = q B f(t) = q A N A at q A natives N A N B at q B immigrants N B population N A +N B N B

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2 Migration = m = proportion of immigrants 1 - m = proportion of natives N B N A + N B New Gene Frequency q new = (1 - m) q A + m q B = q A + m (q B - q A ) Impact depends on: 1) migration m 2) q B - q A difference Random Mating The frequency of a mating is the probability of genotypes combining. f(AA) = p 2 f(Aa) = 2pq f(aa) = q 2 P(AA by AA) = p 2 × p 2 = p 4 P(AA by aa) = P(AA × aa) + P(aa × AA) = p 2 q + q 2 p = 2p 2 q 2
3 Non Random Mating Rules dictating how individuals are paired for mating. 1) changes genotypic frequencies 2) may change gene frequencies Examples 1) positive assortative mating (like to like) 2) negative assortative mating (unlike) Positive Assortative Mating Assume a population in equilibrium: Phenotype

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## This note was uploaded on 03/31/2008 for the course AN SC 221 taught by Professor Pollak,ej during the Spring '07 term at Cornell University (Engineering School).

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Handout11 - Lecture 11 Migration and NonRandom Mating Migration Movement of breeding animals from one population to another Examples exportation of

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