The expected response in the mean of a trait subjected to a single generation of selection from an unselected base population is usually well-approximated by the breeder's equation, R = h2S. This chapter shows how this basic equation generalizes to an important number of settings, such as differential selection on the two sexes, overlapping generations, and selection based on measures other than just an individual's phenotype. It also briefly examines selection response on multiple traits.
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