Introduction to Genetic Analysis 626

Introduction to Genetic Analysis 626 - 44200_19_p611-642...

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Inbreeding and assortative mating Random mating with respect to a locus is common within populations, but it is not universal. Two kinds of deviation from random mating must be distinguished. First, individuals may mate with others with whom they share some degree of common ancestry, that is, some de- gree of genetic relationship. If mating between relatives occurs more commonly than would occur by pure chance, then the population is inbreeding. If mating be- tween relatives is less common than would occur by chance, then the population is said to be undergoing enforced outbreeding, or negative inbreeding. Second, individuals may tend to choose each other as mates, not because they are related but because of their resemblance to each other in some trait. Bias to- ward mating of like with like is called positive assorta- tive mating. Mating with unlike partners is called nega- tive assortative mating. Assortative mating is never com- plete, so that in any population some matings will be at random and some the result of assortative mating. Inbreeding and assortative mating are not the same. Close relatives resemble each other more than unrelated individuals on the average but not necessarily for any particular phenotypic trait in particular individuals. So
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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