INTEGBI 35AC Study Guide - Quiz Guide: Soybean, Crop Rotation, Molecular Clock
23 Oct 2013
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Model for homo sapeiens candelabra (fossil, wrong - directionality), Multiregionalism (fossil), replacement (mtdna), a little intogression (ancient nuclear dna) Dna fossils: populations evolve, not individuals. 4 forces of evolution: mutation only source for new variation, selection diverges populations directionally, drift diverges randomly, migration genetic glue to hold populations together. Types of dna: 44 autosomal & 2 sex, mitochondrial dna. Mitochondrial dna/cell info is found in egg cell: therefore diseased dna can only pass through mother. Mtdna used to find evolutionary history: circular, provides energy needed for cellular function, 100s 1000s copies per cell, easier to trace up mother-child, no recombination, 5-10 times faster mutation rate. Cann, wilson, & stoneking study (1987) in cal: placenta is very rich in mitochondria, n=147, 145 placentas, 2 cell lines from 5 regions (africans, asians, Whites, australians, new guinean: created histogram for # of differences, un do mutation to find coalescence/work backwards to find most common ancestor (more recent vs not)
