Select the odd one out w.r.t polygenic inheritance

Options

A. Bell-shaped curve's obtained
B. Also called quantitative inheritance
C. Recessive alleles show cumulative effect
D. Intermediate phenotypes are more frequent

Answer

### Step-by-Step Solution:

1. **Understanding Polygenic Inheritance**:
- Polygenic inheritance refers to a trait that is controlled by multiple genes. This means that several different genes contribute to the expression of a single phenotypic trait.

2. **Identifying Characteristics of Polygenic Inheritance**:
- Traits under polygenic inheritance often show a bell-shaped curve when graphed, indicating a range of phenotypes.
- Intermediate phenotypes are more frequent in polygenic inheritance, meaning that traits often appear in a gradient rather than in distinct categories.
- Each gene involved contributes additively to the phenotype, and the dominant alleles have a more significant effect on the trait expression.

3. **Evaluating the Options**:
- **Bell-shaped curves**: This is a characteristic of polygenic inheritance.
- **Quantitative inheritance**: This term is synonymous with polygenic inheritance.
- **Intermediate phenotypes are more frequent**: This is also true for polygenic traits.
- **Recessive alleles show cumulative effect**: This statement is incorrect in the context of polygenic inheritance. Recessive alleles do not typically show a cumulative effect; rather, it is the dominant alleles that contribute to the phenotype.

4. **Identifying the Odd One Out**:
- The statement "Recessive alleles show cumulative effect" is the odd one out as it does not accurately describe polygenic inheritance.

### Final Answer:
The odd one out with respect to polygenic inheritance is: **Recessive alleles show cumulative effect**.

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