BSC 201 Lecture Notes - Lecture 8: Sampling Error, Genetic Disorder, Directional Selection
Document Summary
Take all individuals and put them in the same environment (common garden experiment) and notice any variance, which is then due to genetic variance: genetic variance can be found by: Vg = va + vd + vi. For a given trait h^2 = 0 if there is no genetic variation or the environment contributes all phenotypic variation, h^2 = 1 if additive genetic variations contributes. Heritability is a property of populations or groups, not individuals and is population and environment specific. Predicted response to selection r = 0. 78 x 0. 53 = 0. 413. Predicted mean for 1978 offspring 9. 31 + 0. 413 = 9. 72. Magnitude of r: r increases as s increases. More severe or more selective mortality = larger response: r increases as h^2 increases. Greater proportion of additive genetic variance = larger response. Selection and genetic variation: directional selection decreases genetic variation.
