<prompt> What is the risk of downs syndrome in a 35-year-old pregnant woman?1 in 751 in 1001 in 2501 in 1000  <response>: Age of the motherRisk of Down;s syndrome351 in 250361 in 192371 in 149381 in 115391 in 89401 in 69Reference: Williams obstetrics; 25th edition; Chapter 14; Prenatal Diagnosis 