Question

In one of the hybridisation experiments, a homozygous dominant parent and a homozygous recessive parent are crossed for a trait. (Plant shows Mendelian inheritance pattern)

• A. Dominant parent trait appears in F₂ generation and recessive parent trait appears only in F₁ generation.
• B. Dominant parent trait appears in F₁ generation and recessive parent trait appears in F₂ generation.
• C. Dominant parent trait appears in both F₁ & F₂ generations, recessive parent trait appears in only F₂ generation.
• D. Dominant parent trait appears in F₁ generation and recessive parent trait appears in F₁ and F₂ generations.

Answer 1

The Correct Option is C

The correct answer is (C) : Dominant parent trait appears in both F₁ & F₂ generations, recessive parent trait appears in only F₂ generation.

Answer 2

In one of the hybridisation experiments, a homozygous dominant parent and a homozygous recessive parent are crossed for a trait. (Plant shows Mendelian inheritance pattern)

The correct answer is: (C) Dominant parent trait appears in both F₁ & F₂ generations, recessive parent trait appears in only F₂ generation.

In a typical Mendelian inheritance pattern, when a homozygous dominant parent (AA) is crossed with a homozygous recessive parent (aa), all the F₁ offspring will inherit one dominant allele from the dominant parent and one recessive allele from the recessive parent. Therefore, all F₁ individuals will be heterozygous (Aa) and will exhibit the dominant trait.

In the F₂ generation, obtained by crossing two F₁ individuals (Aa × Aa), the offspring will exhibit a 3:1 phenotypic ratio, where three-fourths of the offspring will show the dominant trait and one-fourth will show the recessive trait. This is because the recessive allele can only express its trait when it is present in a homozygous recessive condition (aa), which only appears in the F₂ generation.

Therefore, the dominant parent trait appears in both F₁ and F₂ generations, while the recessive parent trait appears only in the F₂ generation.