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Question

Proportion of progenies with round seed and red flowered pea plants if cross is made between WwRr and ww Rr would be

A
38
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B
18
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C
48
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D
28
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Solution

The correct option is A 38
gametes wR wr
WR WwRR=White flower and Round seed WwRr=White flower and Round seed
Wr WwRr=White flower and Round seed Wwrr=White flower and wrinkled seed
wR wwRR=Red flower and Round seed wwRr=Red flower and Round seed
wr wwRr=Red flower and Round seed wwrr=red flower and wrinkled seed

Gene R control shape of seed- R(Round) is dominant over r(Wrinkled)

Gene W control color of flower- W(White) is dominant over w(Red).

Cross between WwRr x wwRr

Gametes by parent 1 = WR, Wr, wR,and wr

Gametes by parent 2= wR, and wr.

So, looking at the progenies formed in the table by the cross we find that 3 out of 8 progenies will have Round seed and red flowers.

So, the correct answer is '3/8'.



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