Q. A true breeding plant producing red flowers is crossed with a pure plant producing white flowers. Allele for red colour of flower is dominant. After selfing the plants of first filial generation, the proportion of plants producing white flowers in the progeny would be :

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Q. A true breeding plant producing red flowers is crossed with a pure plant producing white flowers. Allele for red colour of flower is dominant. After selfing the plants of first filial generation, the proportion of plants producing white flowers in the progeny would be :

Q. A true breeding plant producing red flowers is crossed with a pure plant producing white flowers. Allele for red colour of flower is dominant. After selfing the plants of first filial generation, the proportion of plants producing white flowers in the progeny would be :

(a) 1/3

(b) 1/2

(c) 3/4

(d) 1/4

Solution :

Correct option : D Genotype of true breeding plant producing red flowers = RR
Genotype of pure plant producing white flowers = rr
P generation: RR x rr
F1 generation: Rr (red flowers)
Selfing: Rr x Rr
Gametes: R r R r
F2 generation: RR Rr Rr rr
Thus, white flower producing progeny is = 1/4.

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