Question

1. Assume that there is a single gene, w, that determines flower color in runner beans....

1. Assume that there is a single gene, w, that determines flower color in runner beans. There are two alleles for this gene: w1 and w2 . The w1 homozygotes have white flowers and w2 homozygotes have red flowers. True-breeding white-flowered plants are crossed to true-breeding red-flowered plants, producing all pink flowered F1 progeny. Female flowers of the F1 progeny are then fertilized by pollen from true-breeding white-flowered plants. What proportion of the progeny from this last cross will have pink flowers?

A. 0

B.1/4

C. 1/2

D. 3/4

E. all of them

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Answer #1

In F1 generation we got all pink flower so this is an example of incomplete dominance so let us assume

R - is an allele which gives red colour flower in homozygous condition (RR)

r - is an allele which gives white colour flower in homozygous condition (rr)

and because its an example of incomplete dominance therefore heterozygous condition will produce pink flowe (Rr)

Genotype of F1 generation flower - Rr

Genotype of pure white flower - rr

Rr * rr

2 Rr and 2 rr so half of the F2 generation flower have pink colour so the correct option would be

C. 1/2

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