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 23P

Three strains of green-seeded lentil plants appear to have the same phenotype. The strains are designated G 1 , G 2 , and G 3 . Each green-seeded strain is crossed to a pure-breeding yellow-seeded strain designated Y. The F 1 of each cross are yellow; however, self-fertilization of F 1 plants produces F 2 with different proportions of yellow- and green-seeded plants as shown below.

Chapter 4, Problem 23P, 23. Three strains of green-seeded lentil plants appear to have the same phenotype. The strains are

For what number of genes are variable alleles segregating in the G 1 * Y cross? The G 2 * Y cross? In the G 3 * Y cross? Explain your rationale for each answer.

b. Using the allele symbols A and a, B and b, and D and d to represent alleles at segregating genes, give the genotypes of parental and F 1 plants in each cross.

c. For each set of F 2 progeny, provide a genetic explanation for the yellow: green ratio. What are the genotypes of yellow and green F 2 lentil plants in the G 2 * Y cross?

d. If green-seeded strains G 1 and G 3 are crossed, what are the phenotype and the genotype of F1 progeny?

e. What proportion of the F 2 are expected to be green? Show your work.

f. If strains G 2 and G 3 are crossed, what will be the phenotype of the F 1 ?

g. What proportion of the F 2 will have yellow seeds? Show your work

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Genetic Analysis: An Integrated Approach (3rd Edition)

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