Which of the following is not a correct dominant-recessive trait pairs of Pisum sativum?

Options

A. Axial-terminal flower position, tall-dwarf stem height
B. Yellow-green pod colour, round-wrinkled seed shape
C. Full-consticted pod shape, Yellow-green seed colour
D. Violet-white flower colour, inflated constricted pod shape

Answer

To determine which of the following is not a correct dominant-recessive trait pair of Pisum sativum (garden pea), we need to analyze the traits and their corresponding dominant and recessive forms as identified by Gregor Mendel. Below is a step-by-step solution:

### Step 1: Identify the Traits
First, we need to list the traits studied by Mendel in Pisum sativum:
1. Seed Shape
2. Seed Color
3. Flower Color
4. Flower Position
5. Plant Height
6. Pod Shape
7. Pod Color

### Step 2: Determine Dominant and Recessive Traits
Next, we will identify the dominant and recessive traits for each category:
- **Seed Shape**:
- Dominant: Round
- Recessive: Wrinkled
- **Seed Color**:
- Dominant: Yellow
- Recessive: Green
- **Flower Color**:
- Dominant: Violet/Purple
- Recessive: White
- **Flower Position**:
- Dominant: Axial
- Recessive: Terminal
- **Plant Height**:
- Dominant: Tall
- Recessive: Dwarf
- **Pod Shape**:
- Dominant: Inflated
- Recessive: Constricted
- **Pod Color**:
- Dominant: Green
- Recessive: Yellow

### Step 3: Analyze the Options
Now, we will analyze the provided options to see which pair does not match the dominant-recessive relationship:
1. **Axial - Terminal Flower Position**: Correct (Axial is dominant)
2. **Tall - Dwarf Stem Height**: Correct (Tall is dominant)
3. **Yellow - Green Pod Color**: Incorrect (Green is dominant, Yellow is recessive)
4. **Round - Wrinkled Seed Shape**: Correct (Round is dominant)
5. **Full - Constricted Pod Shape**: Correct (Full is dominant)
6. **Yellow - Green Seed Color**: Incorrect (Yellow is dominant, Green is recessive)
7. **Violet - White Flower Color**: Correct (Violet is dominant)
8. **Flated - Constricted Pod Shape**: Correct (Inflated is dominant)

### Step 4: Conclusion
From the analysis, the pairs that are incorrect are:
- Yellow - Green Pod Color (should be Green - Yellow)
- Yellow - Green Seed Color (should be Yellow - Green)

However, the question asks for the pair that is not correctly matched. The first incorrect pair identified is **Yellow - Green Pod Color**, as it reverses the dominant and recessive traits.

### Final Answer
**Yellow - Green Pod Color** is not a correct dominant-recessive trait pair.

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