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Unformatted text preview: GENE 3200 MWF - Fall 2009 Exam 1 Bedell Sept 17 ID no. 810________________________________ 1 Write your ID number (810 number, NOT SSN) on every page. Write your initials on the first page only. All of the multiple choice questions have only one correct answer. The exam should be completed in ink. Regrades will not be given if you write in pencil. All requests to re-grade an exam must be made in writing to Dr. Bedell within 48 hours of the grades being posted on WebCT. 1. (1 pt) True or false. An individual with two different alleles of a gene is a heterozygote. 2. (2 pts) How many different genotypes of gametes would be produced by an AaBBCcDDee person? 3. (2 pts) Wildtype Drosophila have red eyes, which is controlled by a single autosomal gene (W for the dominant allele, w for the recessive allele). You have a mutant line of Drosophila that has white eyes, which is recessive to red eyes. After doing a cross of W/w x w/w, you obtain 8 progeny. What is the probability that all of the progeny will have red eyes? Show all of your calculations. 4. (3 pts) In jimson weed, purple flowers (P) are dominant to white (p). Self-fertilization of a particular purple-flowered jimsonweed produces 28 purple-flowered and 10 white-flowered progeny. What proportion of the purple-flowered progeny will breed true? Give a brief justification of your answer. 5. (4 pts) In Drosophila, dumpy (d) results in mutant short wings and rosy (r) results in mutant rosy eye color. Crosses between true-breeding dumpy females and true-breeding rosy-eyed males yielded F1 flies of normal phenotype for both wings and eye color. F1 flies were intercrossed to generate the phenotypes and numbers of F2 progeny in the table below. (cont) For each phenotype class in the table below, fill in the genotypes and expected numbers of progeny if the genes are unlinked. For genotypes, use the gene symbols D and R to indicate the wildtype alleles for the two genes and d and r to indicate the mutant alleles of the two genes. For the expected numbers of progeny, give a brief justification for your calculations. Phenotypes of F2 progeny Genotypes of F2 progeny Number of F2 progeny observed Number of F2 progeny expected Wild type 190 rosy 55 dumpy 62 rosy, dumpy 13 GENE 3200 MWF - Fall 2009 Exam 1 Bedell Sept 17 ID no. 810________________________________ 2 6. (2 pts) Among the dihybrid crosses below, which will give a 1:1:1:1 ratio in their offspring? Assume the genes are unlinked and there is complete dominance. (a) AABB x aabb (b) AaBB x aaBB (c) AaBb x AaBb (d) AAbb x aaBB (e) AaBb x aabb (f) None of the above 7. (4 pts) Albinism is a total lack of skin pigment due to a rare, autosomal recessive gene. If a woman is albino and a man is normally pigmented but his father was albino, calculate the probability of this couple having an albino daughter . Show all equations needed to work this problem and give a brief justification for each answer....
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