Population Genetics & the Hardy-Weinberg Principle (AQA A-Level Biology): Flashcards

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Population Genetics & the Hardy-Weinberg Principle
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Population (in genetics)

Group of organisms of same species in same area at same time that can interbreed

Gene pool

Complete range of alleles present in a population

Allele frequency

How often an allele occurs (as % or decimal)

Hardy-Weinberg principle

Allele frequencies remain constant across generations (if conditions met)

5 conditions for Hardy-Weinberg equilibrium

Large pop, no migration, no mutations, no selection, random mating

Allele frequency equation

p+q=1p + q = 1

Genotype frequency equation

p2+2pq+q2=1p^2 + 2pq + q^2 = 1

p2p^2 in Hardy-Weinberg

Frequency of homozygous dominant genotype

2pq2pq in Hardy-Weinberg

Frequency of heterozygous genotype

q2q^2 in Hardy-Weinberg

Frequency of homozygous recessive genotype

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