Although the Most Frequent Forms of Down Syndrome Are Caused

question 31

Multiple Choice

Although the most frequent forms of Down syndrome are caused by a random error, nondisjunction of chromosome 21, Down syndrome occasionally runs in families. The cause of this form of familial Down syndrome is _.

• A) an inversion involving chromosome 21
• B) too many X chromosomes
• C) a maternal age effect
• D) a translocation between chromosome 21 and a member of the D chromosome group
• E) a chromosomal aberration involving chromosome 1

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