Both directional and stabilizing selection affect the, Ask an Expert

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Both directional and stabilizing selection affect the additive variance in quantitative traits. Given their effects, how much additive genetic variance do we expect to find in traits that affect fitness?(1) What pattern do we actually observe?(1) Describe two hypotheses that can explain the patterns we see (other than the trivial explanation that the population is not at equilibrium)(1), and explain how they work.

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