Introduction to Genetic Analysis 216

Introduction to Genetic Analysis 216 - 44200_06_p185-226...

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215 Problems a. Which mutant would you expect to be deficient in enzyme A activity? b. A plant has the genotype M 1 / m 1 ; M 2 / m 2 . What would you expect its phenotype to be? c. If the plant in part b is selfed, what colors of prog- eny would you expect, and in what proportions? d. Why are these mutants recessive? 6. In sweet peas, the synthesis of purple anthocyanin pigment in the petals is controlled by two genes, B and D . The pathway is 11. Black, sepia, cream, and albino are all coat colors of guinea pigs. Individual animals (not necessarily from pure lines) showing these colors were intercrossed; the results are tabulated as follows, where the abbre- viations A (albino), B (black), C (cream), and S (sepia) represent the phenotypes: a. What color petals would you expect in a pure- breeding plant unable to catalyze the first reaction? What color petals would you expect in a pure- breeding plant unable to catalyze the second reaction?
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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