2nd half of 25 - 2nd half of 25.3 Experimental studies of...

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2 nd half of 25.3 Experimental studies of genetic drift o They used math models at first o Kerr and Wright did an experiment works in practice Started with fruit flies with genetic markers which are alleles that make a certain phenotype They used bristles which were either normal or forked The set up 96 cages in the lab with 4 males and 4 female drosophila in each cage They controlled the frequencies by having 0.5 of each These forked and normal bristles don’t affect fitness, so natural selection doesn’t tamper with this experiment After they reproduced, they took the f1 and randomly chose four males and four famles and let them reproduce They did this to where all 96 mini populations had produced 16 generations They only let genetic drift occur There were three groups that formed In 29 populations, forked bristles were found, the forked allele was fixed and the normal allele was lost In 41 populations, the opposite happened
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