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

\frac{3}{4}

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\frac{1}{4}

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\frac{1}{3}

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\frac{1}{2}

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Solution

The correct option is B $\frac{1}{4}$
True breeding plant with red flowers: RR
True breeding plant with white flowers: rr
Gametes of red flower plant: R
Gametes of white flower plant : r
F $_{1}$ generation: Rr (Red flowers)
Selfing of F $_{1}$ generation:
Rr X Rr
Gametes: R, r X R, r
F $_{2}$ Generation: RR, Rr, Rr, rr (Red, Red, Red, White)
that is 3 Red and 1 white
So, the correct answer is ' $\frac{1}{4}$ '

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