In the tomato, red fruit (R) is completely dominant over green fruit (r) and yellow flowers (W) are completely dominant over white flowers (w). A cross is made between two true breeding plants, one has red fruit and yellow flowers and the other has green fruit and white flowers. The F1 generation has red fruit and yellow flowers. These F1 plants are test crossed to plants with green fruit and white flowers. The following results are obtained:

333 red fruit, yellow flowers
64 red fruit, white flowers
58 yellow fruit, yellow flowers
345 yellow fruit, white flowers
Total of 800

Required:
What are the phenotypes of the recombinant offspring of the F2 generation?

Question

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Histrionicus Histrionicus · Answer 1 · 2021-02-17T09:07:14+01:00

Answer:

The correct answer would be - red fruit white flower (Rrff) and yellow fruit yellow flower (rrFf).

Explanation:

It is given that R is dominant over r and F is dominant over f.

So the possible combination of genotype for Red fruit = RR, Rr

or, Yellow fruit = rr

for Yellow flower = FF, Ff

and White flower = ff

The cross between the true-breeding plants one has red fruit and yellow flowers and the other has green fruit and white flowers

RRFF × rrff = F1 = RrFf (red fruit, yellow flower)

RrFf × rrff

Gametes rf

RF RrFf red fruit yellow flower

Rf Rrff red fruit white flower

rF rrFf yellow fruit yellow flower

rf rrff yellow fruit white flower

Thus, the correct answer would be - Recombinant offsprings - red fruit white flower, yellow fruit yellow flower