Question

Radish flowers may be red, purple, or white. A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring. The part of the radish we eat may be oval or long, with long being the dominant trait. If true-breeding red-flowered long radishes are crossed with true-breeding white-flowered oval radishes, the F1 will be expected to be which of the following?
A) Red and longB) Purple and ovalC) Purple and longD) Red and ovalE) White and long

Answer 1

Answer:

C: Purple and long

Explanation:

• Let R represents flower color. RR genotype will give red flower, Rr will be purple (incomplete dominance) and rr will be white.

• Let L represents radish's length. LL and Ll will give long radishes since long radish allele is dominant over oval radish allele. ll genotype will be result in oval shape radishes.

Crossing RRLL with rrll:

All the progeny will have RrLl genotype (see the attached image for Punnet's square result).

Phenotypically, they will appear with purple colour flower and long radishes.

The correct answer is C.