Multiple choice

To have 47 chromosomes in each cell instead of 46 is a characteristic of

  1. down syndrome

  2. cretinism

  3. hydrocephaly

  4. microcephaly
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A Correct answer
Explanation

Down syndrome (Trisomy 21) is caused by an extra 21st chromosome, resulting in 47 chromosomes instead of the normal 46. Cretinism is from thyroid deficiency, hydrocephaly involves cerebrospinal fluid accumulation, and microcephaly is an abnormally small head - none involve chromosomal count changes.

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