Midterm_I_Key

Midterm_I_Key - Name: _ ID: _ Short Questions: 1. A, B, C,...

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Name: _____________________ ID: _____________________ 1 Short Questions: 1. A, B, C, D, E and F are six independently assorted genes. What is the probability of having a progeny that shows dominant phenotype for all six traits from the cross shown below? Aa BB Cc Dd ee Ff X aa Bb Cc Dd EE ff (1/2) (1) (3/4) (3/4) (1) (1/2) = 9/64 2. Assume complete penetrance, which one(s) of the following pedigrees represent a rare recessive trait? (Circle the correct answer or answers) (a) (b) (c) (d) 3. Gene A and Gene B are tightly linked genes in the plant (no recombination occurs between A and B). You cross a plant that is heterozygous for both A and B genes to a plant that is homozygous recessive for both genes. Among the 1000 progenies generated from this cross, 500 show a dominant A and recessive B phenotype, 499 show a dominant B and recessive A phenotype, and 1 has the dominant phenotype for both A and B genes. What are the parental genotypes? What is the genetic explanation of this phenomenon? (Be concise. We will stop reading after 20 words) The parental genotypes : Ab/aB and ab/ab Nondisjunction in Meiosis I
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Name: _____________________ ID: _____________________ 2 4. A Drosophila geneticist identified three pure-breeding white-eyed strains. The geneticist crossed Strain 1 male to Strain 2 female. All progeny from this cross had white eyes. In a different cross, the geneticist found that all progeny from the cross of Strain 2 male and Strain 3 female had red eyes. Explain this phenomenon and predict the eye-color phenotype of the progeny obtained from the cross of Strain 3 male and Strain 1 female. (Be concise. We will stop reading after 25 words.) Red eyes Strain 1 and Strain 2 are different alleles of a gene. Strain 3 has a mutation in a different gene.
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This note was uploaded on 07/14/2008 for the course LS 4 taught by Professor Ribaya during the Winter '08 term at UCLA.

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Midterm_I_Key - Name: _ ID: _ Short Questions: 1. A, B, C,...

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