Genetic Analysis: An Integrated Approach (3rd Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 4, Problem 8P

Two genes interact to produce various phenotypic ratios among F 2 progeny of a dihybrid cross. Design a different pathway explaining each of the F 2 ratios below, using hypothetical genes R and T and assuming that the dominant allele at each locus catalyzes a different reaction or performs an action leading to pigment production. The recessive allele at each locus is null (loss-of-function). Begin each pathway with a colorless precursor that produces a white or albino phenotype if it is unmodified. The ratios are for F 2 progeny produced by crossing wild-type F 1 organisms with the genotype RrTt .

9 16 dark blue: 6 16 light blue: 1 16 white

12 16 white: 3 16 green: 1 16 yellow

9 16 green: 3 16 yellow: 3 16 blue: 1 16 white

9 16 red: 7 16 white

15 16 black: 1 16 white

9 16 black: 3 16 gray: 4 16 albino

13 16 white: 3 16 green

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Genetic Analysis: An Integrated Approach (3rd Edition)

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