Question

A homozygous tall plant (T) bearing red flowers (R) is crossed with a homozygous dwarf plant (t) bearing white flowers (r)

Give the genotype and phenotype of F-₁ generation.

Answer 1

1. The genotype of the homozygous tall plant bearing red flowers is TTRR and thus the gametes produced by this plant will contain TR genes.
2. Similarly, the genotype of the homozygous dwarf plant bearing white flowers is ttrr and so the gametes produced by this plant will contain tr genes.
3. The Punnett square is used to show the cross between two homozygous parents.

♂ ♀	TR	TR
tr	TtRr	TtRr
tr	TtRr	TtRr

Therefore, the genotype of the F1​ generation will be TtRr and the phenotype of the F1​ generation will be a tall plant with red-colored flowers.