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Population Genetics (Nonrandom mating occurs for a variety of reasons. The…
Population Genetics
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Population genetics is concerned with the distribution of alleles in a population, variation in alleles between populations, and variation in alleles in populations over time
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The concept of the breeding population is key. It means the group of organisms that chooses mates from within that group.
Most of the time, the breeding population is defined based on the research question:
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Nonrandom mating occurs for a variety of reasons. The two basic categories are:•consanguinous mating (mating with relatives)•assortative mating (preference for or avoidance of certain people due to physical and/or social reasons)
Consanguinous mating:•used to be common in many societies for first cousins to marry, e.g., Charles Darwin married his first cousin
ncreases the frequency of homozygotes (genotypes) but does not change the allele frequencies (so more homozygotes & fewer heterozygotes)
genetic results of consanguinous matings:•there is little effect when the alleles are common•but there are big effects when the alleles are rare
This is because first cousins share one set of their grandparents & thus have a greater chance of inheriting the same allele(s) for particular rare genestext**
Assortative mating is very common.People choose mates based on:•physical appearance•education•socioeconomic status•religion•geographic location
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