If two Pea plants having red (dominant) coloured flowers with unknown genotypes are crossed, 75% of the flowers are red and 25% white. The genotype constitution of the two parents would be ______________.

Both homozygous

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Both heterozygous

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Both hemizygous

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One homozygous and other heterozygous.

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Solution

The correct option is B Both heterozygous

A cross is made between two pea plants in which one shows Red dominant flowers and the other genotype is not known. In the next generation 75% plants show red flowers and 25% progeny are white flowers, the phenotype of parents is Tt and Tt, i.e both are heterozygous.
So, the correct option is ‘Both heterozygous’.

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