Question

if mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible?
f₁ generation only
p generation only
f₁ generation and f₂ generation
p generation and f₂ generation

Explanation:

• P generation: The parental generation has the true - breeding recessive plant, so the recessive trait is visible here.
• F₁ generation: When a true - breeding dominant (AA) is crossed with a true - breeding recessive (aa), all offspring in the F₁ generation have the genotype Aa. Since the dominant allele (A) masks the recessive allele (a), the recessive trait is not visible in the F₁ generation.
• F₂ generation: When F₁ (Aa) plants self - cross (Aa × Aa), using the Punnett square, the genotypes are AA:Aa:aa = 1:2:1. The aa genotype shows the recessive trait, so the recessive trait is visible in the F₂ generation.

Answer:

P generation and F₂ generation