Question

A red four o'clock flower (RR) is crossed with a white four o'clock flower (WW) and the resulting F1 offspring are all pink (RW). If two of the pink offspring are crossed, what proportion of genotypes would you expect to see in the F2 generation?

• A. 1 RW: 2 RR: 1 WW
• B. 2 RR: 1 RW: 1 WW
• C. 1RR: 2 RW: 1 WW
• D. 4 RR: 0 RW: 0 WW
• E. 2 RR: 0 RW: 2 WW

Answer 1

Answer: (C)

1RR: 2 RW: 1 WW

The cross can be represented as shown in the figure.

Hence the proportion of genotypes in F2 generation are:

RR : 1

RW : 2

WW : 1

So, the correct answer is '1RR: 2RW: 1WW'.