6 - BIO 94 NOTES (1/16/09) Speciation Inbreeding mating...

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BIO 94 NOTES (1/16/09) Speciation Inbreeding – mating between relatives o Increases the frequency of homozygote and reduces the frequency of heterozygote in each generation Inbreeding does not cause evolution because allele frequencies do not change in the population as a whole. Inbreeding changes genotype frequencies but not allele frequencies. Inbreeding increase homozygosity Inbreeding reduces fitness in humans How are species defined and identified? o People of all cultures throughout history have recognized species as distinct groupings of living organisms o High levels of biological classification – Phylum, Order, Class, Family Genus – are seen as more arbitrary, but the notion of species is seen as fundamental. Why? Because speciation is the point where two lineages become independent in an evolutionary base. Species are evolutionarily independent lineages o Genetic isolation or reduction in gene flow key process in speciation o Usually, speciation creates two or more distinct species from a single ancestry
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6 - BIO 94 NOTES (1/16/09) Speciation Inbreeding mating...

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