ps6q_05

ps6q_05 - MIT Department of Biology 7.014 Introductory...

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MIT Department of Biology 7.014 Introductory Biology, Spring 2005 Name:______________________________________ Section :______ 7.014 Problem Set 6 Answers to this problem set are to be turned in. Problem sets will not be accepted late. Solutions will be posted on the web. Question 1 You are a UROP studying inheritance patterns in Alligators. Some of your alligators have angry dispositions while some are friendly. You determine that the gene for attitude is encoded by a single locus. You cross true-breeding friendly male alligators by true-breeding angry female alligators and notice that all of the off-spring (male or female) are angry. a. What are the possible modes of inheritance of angry dispositions in your alligators? Autosomal dominant Autosomal recessive Sex-linked dominant Sex-linked recessive b. For each of the inheritance patterns you selected in (a.), cross an F1 generation angry, female alligator with an F1 generation angry, male alligator. What will be the phenotypic AND genotypic ratios of the resulting offspring? Use A to refer to the allele conferring dominant attitude phenotype, and a to refer to the allele conferring recessive attitude phenotype. Assume anger is not a sex-linked trait. You notice that oftentimes the angry alligators have long tails while the friendly alligators have short tails. You determine that the short-tailed phenotype is dominant while the long-tailed phenotype is recessive. You want to determine if tail length and attitude are linked. You cross a true-breeding, angry, long-tailed male alligator with a true-breeding, friendly, short-tailed female alligator to get an F1 progeny. You then cross your F1 generation animals and look at the results in the F2 generation. c.
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ps6q_05 - MIT Department of Biology 7.014 Introductory...

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