Skin colour in humans is an example of

Options

A. Polygenic inheritance
B. Pleiotropy
C. Qualitative traits
D. More than one option is correct .

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the genetic basis of skin color in humans. We need to identify the correct genetic concept that describes this trait.

2. **Analyzing Skin Color Variation**: Skin color in humans varies widely, from very dark to very light shades. This variation suggests that multiple factors are involved in determining skin color.

3. **Identifying Genetic Mechanisms**:
- Skin color is influenced by multiple genes. Specifically, it is determined by at least three different genes (let's denote them as A, B, and C).
- Each of these genes can have dominant and recessive alleles. The presence of dominant alleles (e.g., Capital A, Capital B, Capital C) leads to darker skin pigmentation due to higher melanin production.

4. **Understanding Polygenic Inheritance**:
- Polygenic inheritance refers to a situation where multiple genes contribute to a single trait. In this case, skin color is a classic example of polygenic inheritance because it results from the interaction of multiple genes (A, B, and C).
- The more dominant alleles present, the darker the skin color. Conversely, the presence of more recessive alleles leads to lighter skin color.

5. **Evaluating Other Options**:
- **Pleiotropy**: This refers to a single gene affecting multiple traits, which does not apply to skin color as it is influenced by multiple genes.
- **Qualitative Traits**: These traits are typically categorical and do not show continuous variation, which is not the case for skin color.
- **More than One Option is Correct**: Since only one option accurately describes the genetic basis of skin color, this option is incorrect.

6. **Conclusion**: Based on the analysis, the correct answer is that skin color in humans is an example of **polygenic inheritance**.

### Final Answer:
**Skin color in humans is an example of polygenic inheritance.**

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