Human skin colour is controlled by

Options

A. a single allele
B. two alleles
C. atleast three separate genes
D. four alleles

Answer

**Step-by-Step Solution:**

1. **Understanding Skin Color Inheritance**: Human skin color is a trait that does not follow simple Mendelian inheritance. Instead, it is influenced by multiple genes, which means that it is a polygenic trait.

2. **Defining Polygenic Inheritance**: Polygenic inheritance refers to a scenario where a single trait is controlled by two or more genes. This results in a continuous range of phenotypes rather than discrete categories.

3. **Identifying the Number of Genes Involved**: For human skin color, research indicates that at least three separate genes contribute to the variation in skin color. Each of these genes can have multiple alleles, which further increases the diversity of skin tones.

4. **Evaluating the Options**: The question provides four options:
- A) Single allele
- B) Two alleles
- C) At least three separate genes
- D) Four alleles

Since we have established that skin color is influenced by multiple genes, the correct answer is option C: at least three separate genes.

5. **Conclusion**: Therefore, human skin color is controlled by polygenic inheritance, specifically by at least three separate genes.