BIOB51H3 Lecture Notes - Lecture 10: Genome Size, Natural Selection, Heat Shock Protein
3 Mar 2019
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Document Summary
Historical view was natural selection eliminated most variation, little variation is present in current populations. Human tas2r38- affects perception of bitterness in food, has 2 alleles (avi an pav). Avi homozygotes don"t perceive bitter, pav homozygotes perceive bitter excessively especially in cruciferous vegetables expression of. Monozygotic twins are identical, however, if one smokes, then they look older and less healthy than the other. Effect of uv (sunlight) on one side of face (faster aging) Burning or tanning after exposure- 1 individual with one genotype burns (damage to skin and no increase in melanin production), another individual with another genotype tans (increase in melanin, no damage to skin) Knotweed morphology in response to varied intensity of light and number of leaves is measured. When light intensity is low, plants don"t have many leaves and at high light intensity, plants produce many leaves. Shapes/slopes of the norms of reaction are different= gxe.
