BIOLOGY 1M03 Lecture Notes - Lecture 28: Tay–Sachs Disease, Lactase, Inbreeding Avoidance
22 Apr 2017
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Patterns of genetic variation/ skin colour evolutionary psychology. One column is a haplotype, all the grey haplotypes are the same, all the green haplotypes are the same. They share in common the same pattern: initially, there is a 50/50 relationship between white and black alleles. After natural seleciton has occurred for a while, there has been a bene cial mutation that has carried other sequences with it. Crossing over will start to disrupt this pattern. The mutation may be taken apart from its haplotype. With a small selective advantage, the frequency o the allele can sweep to prominence within 7000 years. Convergent adaptation of human lactase persistence in africa and europe. Dairying barriers that affect the dsitributio not lactose malabsorption. You can"t absorb the lactose very well. Gure, larger dots are populations with lactose malabsorption. Far away from the equator, they do better with milk, those closer do worse.
