The form of mental retardation that is caused by the presence of an extra chromosome is _____________?
Correct answer: D. Down syndrome
- A. Severe retardation
- B. hydrocephaly
- C. phenylketonuria
- D. Down syndrome
Explanation
Down syndrome usually results from an extra copy of chromosome 21, called trisomy 21. Hydrocephaly and phenylketonuria have different medical causes and are not forms of chromosomal trisomy.
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