Question

Which of the following is not related to sex chromosome X or Y?

• A. Turner's syndrome
• B. Klinefelter's syndrome
• C. Down's syndrome
• D. Haemophilia and color blindness

Answer 1

The correct option is C

Down's syndrome

The correct option is C:

Explanation of the correct option:

1. Down's syndrome is a chromosomal disorder in which there is a change in chromosomes
2. Trisomy of the 21^st chromosome causes Down's syndrome.
3. It is usually characterized by its round face, palmer crease, and broad forehead.

Explanation of the incorrect options:

Option A:

1. Turner's syndrome is a genetic chromosomal disorder in females in which an X chromosome is missing.
2. The condition is represented by 44 A + XO.

Option B:

Klinefelter's syndrome is a chromosomal disorder in which XXY complexity occurs.

Option D

1. Haemophilia and color blindness are X- linked disorders.
2. The governing genes are present on the sex chromosomes.

Final answer: Down's syndrome is not related to sex chromosome X or Y.