Humans normally have 46 chromosomes. A person born with an extra 21st chromosome (47 in all) would have ______________?
Correct answer: C. Down's syndrome
- A. Turner's syndrome
- B. Kleinfelter's syndrome
- C. Down's syndrome
- D. Pickwickian's syndrome
Explanation
An extra chromosome 21 causes Down syndrome, also called trisomy 21. Turner syndrome involves a missing X chromosome, while Klinefelter syndrome typically involves an extra X in a male.
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