Exam 1 Fall 07 key - NAME: _ EID:_ Bio325 Exam I Write your...

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NAME: __________________ EID:_____________________ Bio325 Exam I Write your final answers and anything you want considered for credit IN PEN. Answers written in pencil will not be considered for re- grades.
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1) You have several pure-breeding strains of guinea pigs with different coat colors. To determine the genetic basis of coat color in these animals, you perform crosses to obtain the F 1 generation, and then cross the F 1 animals with each other to obtain the F 2 generation, as shown below: parental F 1 F 2 1. brown x black black ¾ black, ¼ brown 2. beige x black black ¾ black, ¼ beige 3. brown x beige brown ¾ brown, ¼ beige a. (4 pts) Based on this data, how many genes are involved in the inheritance of coat color in guinea pigs? 1 b. (4 pts) You have a black guinea pig with an unknown genotype. What kind of guinea pig would you cross the black one with to determine its genotype? Black x beige (or self-cross also OK) c. (6 pts) What would be the outcome of the cross described in part b, for every possible genotype of the black guinea pig? C BL C BL x C BE C BE all black C BL C BR x C BE C BE ½ black, ½ brown C BL C BE x C BE C BE ½ black, ½ beige (Self-cross gives all black, ¾ black + ¼ brown, or ¾ black + ¼ beige)
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2) Mark crosses a pure-breeding strain of red-flowering lilies that have short stems with a pure- breeding strain of orange-flowering lilies that have long stems. He finds that all of the lily plants that he obtains from this cross have red flowers and long stems. He then does a self-cross of these plants and counts 44 plants with orange flowers and long stems, 16 plants with orange flowers and short stems, 134 plants with red flowers and long stems, and 46 plants with red
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Exam 1 Fall 07 key - NAME: _ EID:_ Bio325 Exam I Write your...

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