Which of the following is true of Down syndrome (DS)?
a. The brains of DS people are approximately 10 percent lighter than those of normal people.
b. A DS person may be exceptionally talented in a particular area in spite of general mental retardation.
c. People with DS have no distinguishing physical characteristics.
d. People with DS often fail to learn to talk.
e. The incidence of DS is 1 in 10,000 in the United States.
Answer: a. The brains of DS people are approximately 10 percent lighter than those of normal people.
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