KEY TAKEAWAYS •
Populations have a certain gene pool that each of the members draw from.
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Evolution acts on populations rather than on individuals.
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The Hardy-Weinberg Principle depends on a finite population, no mutations, no migration, and no genetic drift.
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Cooperation can improve the state of a population even though competition and natural selection would seem to favor those that are selfish.
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Group living has benefits and costs but for some species, the benefits outweigh the costs.
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In finite populations, there is greater genetic drift, a greater chance of a decline in fitness, and a loss of the frequency of heterozygosity.
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