Which Statement Is NOT True About Down Syndrome

question 1

Multiple Choice

Which statement is NOT true about Down syndrome?

• A)It is caused by a third copy of chromosome 21.
• B)Greatly increased incidence occurs with fathers over age 40.
• C)It is usually associated with chromosomal nondisjunction in meiosis.
• D)Characteristics include mental retardation and extra eyelid folds.
• E)Affected individuals display mental retardation.

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