Mating among relatives

• Consanguineous mating alters genotype frequencies but not allele frequencies.

• Mating among relatives and the probability that two alleles are identical by descent.

• Inbreeding depression and its possible causes.

• The many meanings of inbreeding.

The previous section of this chapter showed how non-random mating can increase or decrease the frequency of heterozygote genotypes compared to the frequency that is expected with random mating. The last section also introduced the fixation index as well as ways to quantify heterozygosity in a population. This section will build on that foundation to show two concepts: (i) the consequences of non-random mating on allele and genotype frequencies in a population and (ii) the probability that two alleles are identical by descent. The focus will be on positive genotypic assortative mating (like genotypes mate) or inbreeding since this will eventually be helpful to understand genotype frequencies in small populations. The end of this section will consider some of the consequences of inbreeding and the evolution of autogamy.

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