Find odd one out (with respect to pea traits).

Options

A. Yellow cotyledon
B. Yellow pod
C. Terminal flower
D. Constricted pod

Answer

To solve the question of finding the odd one out with respect to pea traits, we will analyze each option based on Mendel's seven pea plant traits.

### Step-by-Step Solution:

1. **Identify the Traits**: Mendel studied seven traits in pea plants, which include:
- Stem height (Tall vs. Dwarf)
- Flower color (Purple vs. White)
- Flower position (Axial vs. Terminal)
- Pod shape (Inflated vs. Constricted)
- Pod color (Green vs. Yellow)
- Seed shape (Round vs. Wrinkled)
- Seed color (Yellow vs. Green)

2. **Evaluate Each Option**:
- **A. Yellow Cotyledon**: This trait is dominant (Yellow is dominant over Green).
- **B. Yellow Pod**: This trait is recessive (Yellow is recessive to Green).
- **C. Terminal Flower**: This trait is recessive (Terminal is recessive to Axial).
- **D. Constricted Pod**: This trait is recessive (Constricted is recessive to Inflated).

3. **Determine Dominance and Recessiveness**:
- Yellow Cotyledon (A) is dominant.
- Yellow Pod (B) is recessive.
- Terminal Flower (C) is recessive.
- Constricted Pod (D) is recessive.

4. **Identify the Odd One Out**:
- Among the options, Yellow Cotyledon (A) is the only trait that is dominant. All the other traits (B, C, D) are recessive.

5. **Conclusion**: Therefore, the odd one out is **A. Yellow Cotyledon**.