Medical Genetics The chromosomes in Down syndrome ■Trisomy21; Robertsonian translocation; Mosaic Down syndrome. This document is produced by trial version of Print2Flash.Visit www.print2flash.com for more information
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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 information
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Medical Genetics Trisomy 21 n+1 Sperm cell Zygote 2n+1 n(normal) In about 95%of all patients; Resulting from meiotic nondisjunction; 90%meiotic error responsible for the trisomy usually occurs during maternal meiosis; 10%occur in paternal meiosis; The risk increases with maternal age. This document is produced by trial version of Print2Flash.Visit www.print2flash.com for more informatior
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Medical Genetics Trisomy 21 Karyotype: 器滑路 量道 ●Free trisomy21 47,XX(XY),+21 背寻含菲g音错6数行 11 12 ●Mosaic 育多查音商 等景告骨司首 46,XY147,XY,+21 1415 16 17 18 首洛苦 书商方音有 19 20 21 22 Elsevier.Jorde et al:Medical Genetics 3e-www.studentconsult.com This document is produced by trial version of Print2Flash.Visit www.print2flash.com for more information
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Medical Genetics Robertsonian translocation Karyotype ●Translocation lx ●46，XY,rob(15;21),+21 ib al ak出tt8:iB 10 11 12 13 14 15 a6 16 17 18 88 88 19 20 昌 2 22 This document is produced by trial version of Print2Flash.Visit www.print2flash.com for more information
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