PS2 - Biology 60b Evolution Problem Set 2 Hardy-Weinberg...

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Biology 60b Evolution Problem Set 2 Hardy-Weinberg Equilibrium Please show all work. 1. The trait “vestigial wings” in the fruit fly Drosophila results from a recessive mutation, vg - . Assuming that the population is in Hardy-Weinberg Equilibrium, what is the frequency of heterozygotes ( vg + /vg - ) in a population whose frequency of vestigial winged flies is 1 in 10,000? 2. Industrial melanism is the process by which moths become more darkly colored in response to increased pollution. Kettlewell studied industrial melanism in the peppered moth ( Biston betularia ). In most cases in which the genetic basis of industrial melanism has been analyzed, the melanic (dark) color pattern has been found to be due to a single dominant allele. In one study of a polluted area around Birmingham, UK, Kettlewell observed a frequency of 87% melanic Biston betularia . Determine the frequency of the dominant allele leading to melanism in this population, and the frequency of melanics that are heterozygous. You can assume that selection is not currently underway, and that
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This note was uploaded on 10/06/2011 for the course AAAS 101 taught by Professor Blanc during the Winter '08 term at Brandeis.

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