BIOLOGY 1114 Lecture Notes - Lecture 9: Great Tit, Genetic Variation, Heritability
10 Sep 2018
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What accounts for variation: phenotype variation = genotype variation + environmental variation. Heritability: the proportion of variation that can be attributed to genotype: h2, heritability is high when is low (when environment does not affect penotype as much, h2 determines response to selection, higher h2 means stronger response. If h2=1 , all impact of selection will be observed (perfect fidelity: tophat: heritability of complex adaptations (traits that everyone has) is generally zero. Indicates fidelity of trait transmission (how readily evolution can act on attribute: we all have similar genes to make traits like skin, heart, liver, limbs, basic traits, therefore the presence of these traits is not attributed to heritability. Fitness: refers to ability for survival and reproduction: traits highly correlated with fitness have low heritability, traits not correlated with fitness have high heritability (ex: height, high fitness trait: If genetic variation is low (strong selection), then environmental variation is high.
