Biology · Genetics
The primary cause of 'Down's syndrome' in humans is the:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1presence of an additional copy of chromosome number 21✓
- 2absence of chromosome number 21
- 3presence of an additional copy of the X chromosome
- 4absence of an X chromosome
Correct answer
presence of an additional copy of chromosome number 21
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