Chapter+11

Page 129 1. limited change in incidence until mid-30s; exponential increase after mid-30s; 2. a) 1% +/- 0.5%; b) 1.7-1.0; 0.7% 3. Overall incidence of abnormalities is low to begin with; many types lead to spontaneous abortion; some abnormalities may be present in live birth and be undetected if symptoms are mild; may be a number of different types of trisomy 21; 4. data doesn't discuss risk of advanced age of father; before age of 40, risk of non-disjunction is still relatively small; other possible complications besides chromosomal abnormalities; risk might be balanced by other benefits of postponed parenthood;

Does anyone know the answers for page 130? Especially question 2b?