Medical Genetics 1.1 Down syndrome Phenotype: Mongoloid facial(21q22) Inner eye angles masked by epicanthal folds, Nose:short with nasal bridge, Mouth:Small with thick and protruding tongue, Ears:round and small,low-set. 。Mental retardation .IQ of 50 at the age of 5 years, IQ of 38 at around of 15 years. This document is produced by trial version of Print2Flash.Visit www.print2flash.com for more informationThis document is produced by trial version of Print2Flash. Visit www.print2flash.com for more information