Question

In a back cross between F₁ (Tt) and the homozygous recessive parent (tt), what phenotypic ratio is observed?

Options

• 3:1 ratio of tall to dwarf plants

• 1:1 ratio of tall to dwarf plants

• All dwarf plants

• All tall plants

Answer 1

When F₁ (Tt) is back crossed with the recessive parent (tt), the cross Tt × tt produces Tt and tt offspring in a 1:1 ratio. Tt individuals display the dominant phenotype (tall), while tt individuals display the recessive phenotype (dwarf).