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Down syndrome is one of the most common ...

Down syndrome is one of the most common chromosome abnormalities in humans. It occurs

A

When there is an extra copy of chromosomes 21

B

When there is an extra copy of chromosomes 22

C

When there is an extra copy of chromosomes 11

D

When there is an extra copy of chromosomes 09

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The correct Answer is:
A
Down syndrome is one of the most common chromosome abnormalities in humans. It occurs when there is an extra copy of chromosome 21.
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A2Z-PRINCIPLES OF INHERITANCE AND VARIATION-SECTION C: PREVIOUS YEARS' EXAMINATION QUESTIONS (NEET/AIPMT Questions)
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