A sex linked trait/disease is

Options

A. Colour blindness/haemophilia
B. Night blindness/albinism
C. Myxiedema/beri-beri
D. Deafness/tylosis

Answer

**Step-by-Step Solution:**

1. **Understanding Sex-Linked Traits/Diseases:**
- A sex-linked trait or disease is one that is associated with a gene located on a sex chromosome, typically the X chromosome. These traits can be inherited in a manner that is different from autosomal traits.

2. **Identifying the Options:**
- The options provided are:
1. Colorblindness or Hemophilia
2. Night blindness or Albinism
3. Myxedema or Beriberi
4. Deafness or Loss of hearing

3. **Analyzing the First Option (Colorblindness and Hemophilia):**
- **Colorblindness:** This is an X-linked recessive trait. It is more commonly expressed in males because they have only one X chromosome.
- **Hemophilia:** This is also an X-linked recessive disorder that results in a deficiency of clotting factors, making it more prevalent in males.

4. **Analyzing the Second Option (Night Blindness and Albinism):**
- **Night Blindness:** This condition is primarily due to a deficiency of vitamin A and is not sex-linked.
- **Albinism:** This is an autosomal recessive trait and is not linked to the sex chromosomes.

5. **Analyzing the Third Option (Myxedema and Beriberi):**
- **Myxedema:** This condition is associated with hypothyroidism and is not sex-linked.
- **Beriberi:** This is caused by a deficiency of vitamin B1 (thiamine) and is also not sex-linked.

6. **Analyzing the Fourth Option (Deafness):**
- **Deafness:** This can be caused by various factors, including genetic mutations, but it is not specifically a sex-linked trait.

7. **Conclusion:**
- The only option that contains traits/diseases that are sex-linked is the first option: Colorblindness and Hemophilia. Both are X-linked recessive disorders that predominantly affect males.

**Final Answer:**
A sex-linked trait/disease is Colorblindness or Hemophilia.

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