GENE20001 Lecture Notes - Lecture 29: Wild Type, Industrial Revolution, Selective Sweep
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Can"t become most common allele unless there is some degree of dominance (in terms of impact on fitness) However if we increase the starting frequency to p=0. 1 then we have enough of the favored allele even in the recessive selection case to increase in frequency. Over time genetic recombination means that markers far away will recombine away. It will take much longer for closely linked markers to recombine away. Selective sweep: variation at red locus carries selection for variation closely linked to it. If you see a surprising amount of homozygosity in individuals it may indicate natural selection is acting due to selective sweep. First example of modern natural selection occurred in decades after industrial revolution. Industrialisation caused large areas of the earth"s surface to be blanketed by fallout of smoke particles. Smoke particles kills lichens on the surface of trees. Trees in urban areas tend to be bare and black.
