Question

If two pea plants having red (dominant) coloured flowers with unknown genotypes are crossed, 75% of the flowers are red and 25% are white. The genotypic constitution of the parents having red coloured blowers will be:

Options

• Both homozygous

• One homozygous and other heterozygous

• Both heterozygous

• both Homozygous

Answer 1

Both heterozygous

Explanation:

Following Mendel's law, when two pea plants with red dominant flowers and unknown genotypes are crossed, 75% red and 25% white flowered plants are produced. Only if both parents are heterozygous is this feasible.