Which are two major alleles for eye colour?

Options

A. brown and black
B. blue and black
C. brown and blue
D. black and grey

Answer

To answer the question regarding the two major alleles for eye color, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Alleles**:
- An allele is a variant form of a gene that can produce different traits. In the context of eye color, alleles determine the pigmentation of the iris.

2. **Identifying Common Eye Colors**:
- The most common eye colors in humans include brown, blue, green, and gray. However, the prevalence of these colors can vary by population.

3. **Determining Dominant and Recessive Alleles**:
- In genetics, brown is typically considered a dominant allele, while blue is a recessive allele. This means that if a person has one allele for brown eyes, they will likely have brown eyes, whereas blue eyes will only appear if both alleles are for blue.

4. **Selecting the Two Major Alleles**:
- Based on the understanding of dominance and the prevalence of eye colors, the two major alleles for eye color are brown and blue.

5. **Final Answer**:
- Therefore, the two major alleles for eye color are **brown and blue**.