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 B $\frac{1}{4}$
A cross between pure breeding red (RR) and white (rr) flowered plants produces heterozygous red (Rr) offspring in first filial generation. Heterozygous red (Rr) offspring produce two types of gametes: 50% with R allele and 50% with r. Random fertilization of gametes with R and r alleles produces red and white flowered offspring in 3:1 ratio.

gametes Rr
Rr R r
R RR (red) Rr (red)
r Rr (red) rr (white)
This makes option B correct answer.

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