Question

The following results were obtained by a scientist who crossed the F1 generation of pure-breeding parents for round and wrinkled seeds. Dominant trait
Recessive trait
No. of F2 offspring
Round seeds
Wrinkled seeds
7524
From these results, it can be concluded that the actual number of round seeds he obtained was
(a) 1881
(b) 22572
(c) 2508
(d) 5643

Answer 1

Explanation:

The ratio of round seeds (dominant trait) to the wrinkled seeds ( recessive trait) is 3:1. Therefore, the number of round seeds = (7524 x 3 )/4 = 5643.

Hence, option(d) is correct.

Answer 2

The correct answer is d

Explanation:

• when both round "RR" and wrinkled "rr" seed bearing plants  are crossed together,all hetrozygous round seeds bearing plants are obtained in F 1 generation.

• Then the plants of these F 1  generation  are cross bred, the F 2 generation had cross and wrinkled seed bearing plants were obtained in the ratio of 3:1 ( total 4  plants).

• Hence ;  3*7524/4 = 5643.