Question

Identify the incorrect pair: 

Character	Dominant Trait	Recessive Trait
I	Seed colour Green	Yellow
II	Flower colour White	Violet
III	Flower position Axial	Terminal
IV	Pod colour Green	Yellow

• A. I and II only
• B. II and III only
• C. III and IV only
• D. I and III only

Hint:

For Mendel's peas: Yellow seed colour, Violet flower colour, Green pod colour and Axial flower position are dominant traits.

Answer 1

The Correct Option is A

Concept: Mendel studied seven pairs of contrasting traits in pea plants. Each trait had one dominant and one recessive expression. Knowledge of these traits is essential for solving genetics questions.

Step 1: Examine Pair I. Seed colour: \[ \text{Yellow} = \text{Dominant} \] \[ \text{Green} = \text{Recessive} \] The given pair is reversed. Hence Pair I is incorrect.

Step 2: Examine Pair II. Flower colour: \[ \text{Violet} = \text{Dominant} \] \[ \text{White} = \text{Recessive} \] Again the given pair is reversed. Hence Pair II is incorrect.

Step 3: Examine Pair III. Flower position: \[ \text{Axial} = \text{Dominant} \] \[ \text{Terminal} = \text{Recessive} \] This pair is correct.

Step 4: Examine Pair IV. Pod colour: \[ \text{Green} = \text{Dominant} \] \[ \text{Yellow} = \text{Recessive} \] This pair is also correct.

Step 5: Final conclusion. Incorrect pairs are: \[ I \text{ and } II \] Hence option (A) is correct.