Question

This Punnett square shows a cross between two tall pea plants.

Describe the genotypes and phenotypes of the offspring.

Answer 1

Two tall pea plants means that T is dominant, and t is recessive.

From the Punnett square, one parent is homozygous dominant (TT),and the other is heterozygous (Tt).

Since the allele T is dominant and one of the parents is homozygous dominant, all offspring genotypes have at least one dominant allele, hence all offsprint phenotypes are tall.

The offspring genotypes are in the ratio 50-50 for homozygous dominant (TT) and heterozygous (Tt).