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Q. Assume that pesticide resistance in beetles is a quantitative trait that can be measured as the number of days a beetle survives after exposure to the pesticide. The least resistant beetles die within one day, while the most resistant beetles can live for 12 days after exposure.
a) Illustrate an experiment that you could use to measure how this population of beetles responds to the selection that occurs when the population is exposed to the pesticide. Include details about how you would control non-genetic sources of variation.
b) Sketch a graph showing the response to selection if the heritability, h2, of pesticide resistance is 0.2.
c) Sketch another graph showing the response to selection if the heritability, h2, of pesticide resistance is 0.8.
Assume you ingest 20 cells of Salmonella typhimurium in a chicken taco. Some of the bacteria are killed as they pass through the stomach but ten viable cells survive and reach the intestine.
Are they necessarily required or simply an artefact of the evolutionary history of eukaryotes. Why, for example, would eukaryotic cells require a membrane-bound nucleus when prokaryotes seem to replicate efficiently without one.
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If one assumes that Hardy-Weinberg equilibrium applies to population of colonists on this planet, about how many people will have attached ear lobes at what time the planet's population reaches 10,000.
Upon entering graduate school, you heard rumors about a student, who was totally inspired by a "rusty nail experience".
Consider the tetrahybrid cross between AaBbCCDD and AaBbCcDd. Assume that it is a dominant/recessive system and all genes are unlinked. What proportions of the offspring will have the recessive Phenotype for all four characteristics?
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