Find the odd one (w.r.t polygenic inheritance)

Options

A. `1:4:6:4:1`
B. `9:3:3:1`
C. `1:8:28:56:70:56:28:8:1`
D. `1:15:15:20:6:1`

Answer

### Step-by-Step Solution:

1. **Understanding Polygenic Inheritance**:
- Polygenic inheritance, also known as quantitative inheritance, involves multiple genes controlling a single trait. This means that the phenotype (observable characteristics) is influenced by the cumulative effects of several genes.

2. **Identifying the Options**:
- The question asks to find the odd one out with respect to polygenic inheritance. We need to analyze the given ratios and determine which one does not fit the criteria of polygenic inheritance.

3. **Analyzing the First Option (1:4:6:4:1)**:
- This ratio is characteristic of polygenic inheritance. Specifically, it is related to the kernel color of wheat, which is influenced by multiple genes. Therefore, this option is not the odd one out.

4. **Analyzing the Second Option (9:3:1)**:
- This ratio is typical of a dihybrid cross, where two traits are considered, each controlled by a different gene. This ratio does not represent polygenic inheritance, as it only involves two genes. Hence, this option is the odd one out.

5. **Analyzing the Third Option**:
- The third option is not explicitly mentioned in the transcript, but if it were related to polygenic inheritance, it would not be the odd one out.

6. **Conclusion**:
- The odd one with respect to polygenic inheritance is the second option (9:3:1), as it represents a dihybrid cross and not polygenic inheritance.

### Final Answer:
The odd one out with respect to polygenic inheritance is option 2 (9:3:1).

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