BIOLOGY 1M03 Lecture Notes - Lecture 15: Heterozygote Advantage, Evolutionary Psychology, Selective Sweep
11 Aug 2018
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Document Summary
Initial clades mutated and produced other clades hat spread to other continents: microsatellite dna diversity (and other genetic data) supports the hypothesized dispersal out of. Genetic variation and natural selection in homo sapiens. Chimps have light skin: darkens with age, protected by hair, ancestors shared with humans likely were light skinned. Skin colour is partly genetic: we know that there is genetic element to skin colour. Lighter constitutive pigmentation is associated with a higher sunburn response, a lower tanning response, a greater susceptibility to skin cancers and infections following skin burning, and most importantly a tendency for folate damage: need for vitamin d synthesis. Sufficient light n skin to make vitamin d3: depenatrating uv cause break down of follic acid. Folatedeficiencies play a negative role in reproductive and developmental processes (neural tube defects, early pregnancy losses among others) Uvb light is needed to make vitamin d3.
