biology / Evolution & Ecology / free

Population Genetics

Track how variation and selection reshape a population over generations.

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A gene pool contains variation. Individuals contribute allele copies to a shared population, so the starting frequency records variation that can be passed to the next generation.

allele-frequency changeselection raises A · generation 10

Focus the idea

A allele66.3%

change+24.3%

heterozygosity44.7%

population80

Starting A allele 42%Selection for A +24%Population size 80Generations 10

Selection favors A, so its expected frequency rises when A is heritable. The actual path can wobble around that expectation.

This is a deterministic teaching proxy for a diploid Wright–Fisher-style population. Real populations add mutation, migration, non-random mating, changing fitness, and demographic history.

04 / PRACTICE

Make the biology yours.

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Answer from the model, then use the explanation to connect the visual mechanism to the biological rule.

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Population Genetics

Make the biology yours.

What does allele frequency count?