Q22. Down's syndrome is a result of gain of extra copy of
chromosome number:
(a) 21
(b) 20
(c) 19
(d) 22

Question

FirstInTest · Accepted Answer

Correct answer: a. Down's syndrome, also clinically known as Trisomy 21, is a genetic disorder caused by the presence of an extra copy of chromosome 21. Instead of the usual two copies, individuals with Down's syndrome have three copies of chromosome 21. This chromosomal abnormality leads to a specific set of physical features, intellectual disability, and developmental delays associated with the syndrome. It is one of the most common chromosomal disorders in humans.

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