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On average, what percentage of infants born to 45-year-old mothers have Down syndrome? a) 1% b) 3% c) 8% d) 10% e) 30%
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- According to the graph, at what maternal age is the incidence of Down syndrome equal to five times the incidence at age 40? a) about 29 or 30 b) about 35 or 36 c) about 44 or 45 d) about 46 or 47