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Final Exam answer key A

Final Exam answer key A - EXAM A ANSWER KEY PART I PROBLEMS...

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EXAM “A” ANSWER KEY PART I PROBLEMS 1)  You are studying the population in Iceland for X-linked alleles, and sampling experiments indicate that about 6% of the men have red-green color blindness (caused by a recessive, X-linked allele c ). Assume that the population in Iceland mates randomly. a. What are the frequencies of the X-linked allele for men and for women? b. What percentage of women is expected to be color blind? c. What percentage of individuals in the population is expected to be normal carriers for the color-blind allele? d. After two generations, what percentage of men in the population is expected to be color blind? To have normal vision? 2) You discover a certain species of weed growing in soil contaminated with toxic PCBs, and later determine that the PCB resistance is due to a single dominant allele. a. If 45% of the seeds from a randomly mating population of resistant weeds will germinate in contaminated soil, what is the frequency of the PCB- resistance allele? b. Among all the plants that germinate, what proportion will be heterozygous?
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c. What proportion will be homozygous dominant? 3) An evolutionary biologist samples a population of 200 people for a number of immunity loci. She finds 100 such loci in each person. Across the whole population, she finds that 75 loci have more than one allele.
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