MT1Key - 1 MCB 41 Mid-term I KEY STUDENTS This key...

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1 MCB 41 February 21, 2007 Mid-term I KEY STUDENTS: This key indicates the common correct answers. Partial credit was given for many variations, and different ways to stating the answer. Please read instructions for each question carefully . 1. A pedigree is shown of 3 generations of a family in which some members were color blind for green . Those afflicted are shown with darkened symbols. One female marked with an asterisk (*) in the F-1 also had children (father unknown) but none were color blind. ( 10 pts) a. Which type of chromosome carries the gene? _X______ b. Is it dominant or recessive? __Recessive________ c. What is the genotype of afflicted individuals? _recessive gene (X mutant)/Y or no Y _______ d. Which individuals ( mark them with an X in the box or circle of the diagram ) must be carriers of the gene.? (F-1 females on the two ends) 2pts e. Suggest a molecular technology that might be able to diagnose whether a person is a carrier or not? _____PCR, or DNA sequencing_______ 2. Make some predictions from the following cross between true breeding strains of pea plants (8 pts). The phenotype of one parent yellow pods and Tall stems. The genes are designated g and T. The phenotype of the other parent is green pods and dwarf stems. The genes are designated G and t. a. What is the genotype of the F-1? GgTt b. If the G and T genes are not linked, what are the genotypes of the gametes that are produced by the F-1? GT, gT, Gt, gt
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