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Q. Which is not sex linked...

Q. Which is not sex linked

A

a) Colour blindness

B

b) Myopia

C

c) Haemophilia

D

d) Down's syndrome.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks to identify which condition is not sex-linked among the given options: colorblindness, myopia, hemophilia, and Down syndrome. 2. **Analyzing Each Option**: - **Option A: Colorblindness**: This is known to be an X-linked recessive disorder. It is inherited through the X chromosome, making it a sex-linked condition. - **Option B: Myopia**: Myopia, or nearsightedness, is a common vision condition that is not caused by a single gene and is not inherited in a sex-linked manner. It is not classified as a genetic disorder, making it not sex-linked. - **Option C: Hemophilia**: Hemophilia is also an X-linked recessive disorder. It is inherited through the X chromosome, thus it is a sex-linked condition. - **Option D: Down Syndrome**: Down syndrome is caused by an extra copy of chromosome 21 (trisomy 21) and is not linked to the sex chromosomes. Therefore, it is not classified as a sex-linked disorder. 3. **Conclusion**: After analyzing all the options, the only condition that is not sex-linked is myopia (Option B). 4. **Final Answer**: The correct answer is **Option B: Myopia**. ---
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