Question

Trisomy of $21$st chromosome results in

• A. Down's syndrome
• B. Sickle cells anaemia
• C. Turner's syndrome
• D. Klinefelter's syndrome

Answer 1

The correct option is A Down's syndrome

Down syndrome also known as trisomy 21, is a genetic disorder caused by the presence of all or part of the third copy of chromosome 21.

So, the correct answer is 'Down's syndrome'.