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 long radishes are crossed with true-breeding white oval radishes, the F1 will be expected to be which of the following?
a. White and long
b. Red and oval
c. Red and long
d. Purple and oval
e. Purple and long

Answer 1

Answer:

Option E, Purple and long

Explanation:

Let the allele for red-flowered plant  be "R" and allele for white -flowered plant  be "r"

Allele for long radish be "L" and oval radish be "l"

Given -

A cross between a red-flowered plant (RR) and a white-flowered plant (rr)yields all-purple offspring (Rr)

And

Long is a  dominant trait

Cross is carried out between  true-breeding red long radishes (RRLL) are crossed with true-breeding white oval radishes (rrll)

The gametes for the two parents would b e

RL, RL , RL, RL

rl, rl, rl, rl

Thus, genotype of offspring would be "RrLl"

So all the offspring would be "Purple long"

Hence , option E is correct