Down's syndrome is caused by ______________________?
Correct answer: C. an extra autosome or part of one
- A. a recessive gene
- B. a missing sex chromosome
- C. an extra autosome or part of one
- D. an extra sex chromosome or part of one
Explanation
Down syndrome usually results from trisomy 21, meaning an extra copy of an autosome. It is therefore not caused by an extra or missing sex chromosome.
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Practise Developmental Psychology
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