## The theory of natural selection (part 1)

This tutorial introduces formal population genetic models. We first establish what the variables are that the models are concerned with, and the general structure of population genetic models. We look at the Hardy-Weinberg equilibrium, and see how to calculate whether a real population fits it. We then move on to models of natural selection, concentrating on the specific case of selection against a recessive homozygote. We apply the model to two examples: the peppered moth and resistance to pesticides.

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