Question

Assertion (A): In a monohybrid cross, at F₂ stage, both parental traits are expressed in the proportion of 3 : 1. 

Reason (R): At F₁ stage, the contrasting parental traits show blending but at F₂ stage there is no blending.

Options

• Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.

• Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

• Assertion (A) is true but reason (R) is false.

• Both assertion (A) and reason (R) are false.

Answer 1

Assertion (A) is true but reason (R) is false.

Explanation:

The assertion is true: both parental traits reappear in F₂ in a 3 : 1 ratio in a typical monohybrid cross. The reason is false because Mendelian F₁ offspring do not show blending; they express the dominant trait.