Which statement about Down syndrome is correct?
A) Down syndrome is caused by a third copy of chromosome 21.
B) Down syndrome is usually associated with chromosomal nondisjunction in meiosis.
C) Characteristics of Down syndrome include stubby fingers and a palm crease.
D) Individuals affected with Down syndrome display mental impairment.
E) All of the answer choices are correct about Down syndrome.
Ans: E) All of the answer choices are correct about Down syndrome.
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