Meiosis I Nondisjunction Meiosis ll The mechanism of Down syndrome Nondisjunction Gametes n+1 n+ n+ Number of chromosomes (a)Nondisjunction in meiosis I (b)Nondisjunction in meiosis ll Egg cell n+1 Sperm cell Zygote 2n+1 n (normal) 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