3.1 Population and Evolutionary Genetics Flashcards Preview

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Flashcards in 3.1 Population and Evolutionary Genetics Deck (9)
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Define population

The study of the distribution and change in frequency of alleles within populations


Define evolution

A change in gene frequency over time in a population


Define natural selection

is the differential survival and reproduction of individuals due to differences in phenotype


Define artificial selection

selection by promoting the reproduction of organisms with traits perceived as desirable


Define homozygous by descent vs by state

Descent: alleles descended from the same copy in a common ancestor. State: Alleles that are the same in the structure and function but are descended from 2 dif copies of ancestors.


What is heterozygote advantage

Heterozygotes are favored over homozygotes and have a reproductive advantage which maintains both alleles in the population


What are the 5 assumptions of the Hardy-Weinberg law

Large population, random mating, no mutation, no migration, no natural selection


How can an isolated population be useful for identifying rare genetic variation?

These populations have reduced genetic diversity, thus rare variants may drift to higher frequencies


What are the implications of inbreeding

Increases percentage of homozygous individuals in a population. Increases appearance of lethal and deleterious traits with inbreeding.