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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1

Define population

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

2

Define evolution

A change in gene frequency over time in a population

3

Define natural selection

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

4

Define artificial selection

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

5

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.

6

What is heterozygote advantage

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

7

What are the 5 assumptions of the Hardy-Weinberg law

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

8

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

9

What are the implications of inbreeding

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