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Study Questions Quiz3

Study Questions Quiz3 - 1 Mutation selection and genetic...

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1. Mutation, selection, and genetic drift interact to cause allele frequencies to change. Explain what happens to the frequency of a new mutant allele and its ultimate fate in a population, and the evolutionary force(s) responsible, in the following 3 situations: A) new mutation appears which is deleterious B) new mutation appears which is neutral C) new mutation appears which is advantageous 2. A population of 100 individuals contains 140 A1 alleles and 60 A2 alleles at the “A” locus. If there is no mutation , and the three genotypes are selectively neutral , what would you expect the genotype and allele frequencies to be a long time (say 10,000 generations) in the future? 3. Lewontin and Hubby used protein electrophoresis in 1966 to demonstrate extensive protein polymorphism in populations. Why did this observation shake the foundations of evolutionary biology? 4. You discover 2 populations of the same fish species – one population that thrives in freshwater, and one that thrives in brackish (moderately salty) water. Describe a simple experimental design to answer the following hypothesis; that these populations have evolved adaptation to their respective local environments. 5. The following table gives the number of genotypes at a disease-resistance locus in a human population for 5 populations. Which populations are in Hardy-Weinberg equilibrium ? For each of those that are not, suggest some hypotheses for why they are not. Genotype Population AA Aa aa 1 25 50 25 2 10 80 10 3 40 20 40 4 0 150 100 5 2 16 32 6. The figure below represents data from an experiment that shows that the frequency of the Adh F allele in fruit flies does change over time under natural selection, but does not
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change in un-selected lines. Looking closer at the unselected lines, though, we see that frequencies do change a little, fluctuating up and down, over time. Which assumption of the Hardy-Weinberg model is most likely being violated ? If you were to re-do this experiment, what would you change
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Study Questions Quiz3 - 1 Mutation selection and genetic...

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