Principle of Inheritance and VariationMedium

Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: In an experiment, Mendel observed that the F1 progeny plants are all tall and none are dwarf.

Reason R: Stem height is a contrasting trait, with tall being dominant and dwarf being recessive.

In the light of the above statements, choose the most appropriate answer from the options given below:

Options

A.$\mathbf{A}$ is correct but $\mathbf{R}$ is not correct
B.$\mathbf{A}$ is not correct but $\mathbf{R}$ is correct
C.Both $\mathbf{A}$ and $\mathbf{R}$ are correct and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$
D.Both A and R are correct but R is not the correct explanation of A

Solution

Sol. [Key Concept: Assertion–Reason evaluation]

Mendel crossed tall and dwarf plants and observed that all the $F_{1}$ progeny plants are tall.

The trait ' $T$ ' or tall is said to be dominant over the other allele ' $t$ ' or 'dwarf' trait.

It is thus due to this dominance of one trait over the other that all the $F_{1}$ are tall.

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