BIO120H1 Lecture Notes - Lecture 8: Stabilizing Selection, Glucose-6-Phosphate Dehydrogenase Deficiency, Crypsis
3 Oct 2018
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Bio120 lecture 8: natural selection and adaptation. October 3, 2018 (relevant reading why evolution is true, coyne: chapter 5) Tradeoffs associated with skin pigmentation: high uv radiation: interferes with folate, may have selected for increased pigmentation, low uv radiation: reduced vitamin d synthesis, may have selected for reduced pigmentation. Was there a history of local adaptation on skin pigmentation: numerous genes affecting skin pigmentation identified, these genes show higher between-population differences than average gene, provides evidence supporting a history of local adaptation. Other genomic evidence for local adaptation in humans: disease resistance, lactose tolerance, human height. Bighorn sheep: studies suggest that as an adaptation to being easily hunted by humans, bighorn sheep are shrinking to better hide from humans blend in with their environment. Natural selection and adaptation: types of selection, artificial vs natural, modes of selection, selection and adaptation in action, testing adaptation, evolution of herbicide resistance, human evolution-g6pd deficiency, evolution in the laboratory.
