Prelim1 - 1 BioGD 281 First Preliminary Exam Name Last...

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BioGD 281 First Preliminary Exam February 22, 2007 Name Last First Lab Section and Instructor (or BioGD 280) This exam has 7 questions plus a bonus question on 13 pages. Make sure you have a complete copy before you begin. Two blank pages have been attached at the end for use as scratch paper. Put all answers in the boxes provided. Only answers in boxes will be graded. 1 ______ 2 ______ 3 ______ 4 ______ 5 ______ 6 ______ 7 ______ Bonus ______ Total ______ 1
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Question 1 (10 points) A true-breeding legume with white flowers and long pods is crossed to another true-breeding legume with purple flowers and short pods. The F 1 offspring are allowed to self-fertilize, and the F 2 generation has 301 long purple, 99 short purple, 612 long pink, 195 short pink, 295 long white, and 98 short white. a) (2 points) What was the phenotype of the F 1 plants? b) (8 points) Give genotypes for the following phenotypic classes: Parental white long Parental purple short F 2 long purple F 2 short purple F 2 long pink F 2 short pink F 2 long white F 2 short white 2
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Question 2 (15 points) Suppose that the wild-type flowers of a particular plant species are red. Recessive alleles at three unlinked genes affecting flower color cause the following phenotypes (wild-type is shown for comparison): Genotype Phenotype wwBBYY white WWbbYY blue WWBByy yellow WWBBYY red (wild-type) Plants bearing homozygous recessive alleles at two genes, or at all three genes, had the following phenotypes: Genotype Phenotype wwbbYY white wwBByy white WWbbyy yellow wwbbyy white a) (5 points) These data are consistent with a linear pathway of reactions leading to red pigment, that are controlled by the three genes. In the box below, diagram this pathway.
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  • Spring '07
  • FOX/NERO
  • Genetics, genotype aa, wwbbyy wwbbyy wwbbyy

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