BIOL 2400 Lecture Notes - Lecture 5: Epistasis, Selective Breeding, Human Height
12 Sep 2017
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Response to sele(cid:272)tion (cid:271)y a darwin"s fin(cid:272)h: heritability estimation, human height, finch beaks, b(cid:396)eede(cid:396)"s e(cid:395)uation, response to selection, genetic constraints on evolution, variances. Height of 2009 evolution class members: narrow sense heritability, h2 is the slope. Beak size evolution in next generation: response to selection is change in mean, response to natural selection is variable over time. Actual response (r) of medium ground finches to selection by 1977 drought. Evolutionary response (r) to selection: how much the population changes depend on, selection differential (s, narrow sense heritability (h2, = 2 . Is heritable: response to natural selection documented, directional selection favours increases or decreases in the mean of beak size. Long-term studies reveal fluctuation in the direction and strength of directional selection. B(cid:396)eede(cid:396)"s e(cid:395)uation with a(cid:396)tificial selection: = 2 , high heritability results in larger response (r) (cid:198)where (a) is generation 1 and (b) is generation 2.
