An X- linked recessive trait is

Options

A. Colour blindness
B. Hunter's syndrome
C. Sickle cell anaemia
D. Leishman's syndrome

Answer

### Step-by-Step Solution:

1. **Understanding X-linked Recessive Traits**:
- X-linked recessive traits are genetic conditions that are associated with genes located on the X chromosome. These traits are typically more common in males because they have only one X chromosome (XY), while females have two (XX). If a male inherits an X-linked recessive allele, he will express the trait, whereas a female would need to inherit two copies of the allele to express the trait.

2. **Analyzing the Options**:
- The question provides four options:
- A. Colorblindness
- B. Hunter Syndrome
- C. Sickle Cell Anemia
- D. Leishman Syndrome

3. **Evaluating Each Option**:
- **Colorblindness**: This is a well-known X-linked recessive trait. It affects the ability to distinguish between certain colors and is more prevalent in males.
- **Hunter Syndrome**: This is an X-linked recessive disorder, but it is not a trait that is typically referred to in the context of color vision.
- **Sickle Cell Anemia**: This is an autosomal recessive disorder, not linked to the X chromosome.
- **Leishman Syndrome**: This is not an X-linked trait; it is associated with parasitic infections.

4. **Identifying the Correct Answer**:
- Based on the analysis, colorblindness is the only option that is an X-linked recessive trait. Therefore, the correct answer is **A. Colorblindness**.

### Final Answer:
The correct answer is **A. Colorblindness**.

---