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Use the graph and your knowledge of Down syndrome to select the three true statements. a) The number of infants born with Down syndrome increases at a steady rate from maternal age 25 to 50. b) The incidence of Down syndrome in infants born to mothers under the age of 35 is less than 0.5%. c) Down syndrome is caused by a trisomy of chromosome 21. d) The risk of having a baby with Down syndrome more than doubles for 45-year old mothers compared to 40-year old mothers. e) The largest five-year increase in the incidence of Down syndrome occurs between the maternal ages of 35 and 40.

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