BIOLOGY 1M03 Lecture Notes - Lecture 26: Human Skin Color, Folate Deficiency, Agouti Signalling Peptide
19 Mar 2017
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Document Summary
Mtdna can be used to track the common ancestor. L1 are the most ancient roots; from africa. L2 is also from africa: m and n are moving out of africa into asia, europe, oceania, and north america. Used in forensic studies: downward slope; the further from africa, less diversity (loss due to migration, bottleneck) Genetic variation and natural selection in homo sapiens: Human skin color: chimps have darker skin; which gets darker with age and bodies were protect with hair. Lighter people have a greater possibility to have skin infection and cancer; and a deficiency of folate. Uvb is needed to make vitamin d3: vitamin d3 is necessary for efficient use of dietary calcium. It"s also required for proper growth of bones and vertebrates: recent evidence suggests that vitamin d3 improves immune system and improves the chances to stay cancer-free. In winter, all of us must take vitamin d supplements in order to protect our dna.
