RT Book, Section A1 Bianchi, Diana W. A1 Crombleholme, Timothy M. A1 D'Alton, Mary E. A1 Malone, Fergal D. SR Print(0) ID 1106402216 T1 47, XYY T2 Fetology: Diagnosis and Management of the Fetal Patient, 2e YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 978-0-07-144201-5 LK obgyn.mhmedical.com/content.aspx?aid=1106402216 RD 2024/10/10 AB Key PointsIncidence is 1 in 1000 males.Most cases are undiagnosed.Not associated with advanced parental age.There are no characteristic fetal sonographic findings.IQ of affected males is in the normal range, but 10-15 points lower than siblings.Mild learning disabilities involve verbal but not mathematical skills.Adult males are tall, thin, and fertile.Pregnant partners of adult males with 47, XYY should be offered testing for the fetal karyotype due to the increased incidence of sex chromosome abnormalities in sperm.