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

\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 D $\frac{1}{4}$
Genotype of true breeding plant producing red flowers = RR
Genotype of pure plant producing white flowers = rr
P generation: RR x rr
F $_{1}$ generation: Rr (red flowers)
Selfing: Rr x Rr
Gametes: R r R r
F $_{2}$ generation: RR Rr Rr rr
Thus, white flower producing progeny is = 1/4.

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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

The correct option is D 14Genotype of true breeding plant producing red flowers = RRGenotype of pure plant producing white flowers = rrP generation: RR x rrF1 generation: Rr (red flowers)Selfing: Rr x RrGametes: R r R rF2 generation: RR Rr Rr rrThus, white flower producing progeny is = 1/4.