User:ReeseLanger/sandbox

Introduction

 * This is my sandbox page. I'm using this to get practice with Wiki as well as to prepare for writing an article. It will allow me to work out ideas!!!

Pillar 1

 * 1) 1 Wikipedia is an online encyclopedia

Pillar 2

 * 1) 2 Wikipedia has a neutral point of view

Pillar 3

 * 1) 3 Wikipedia is free

Pillar 4

 * 1) 4 Respect others

Pillar 5

 * 1) 5 There isn't a handbook of set rules

Trisomy 21
Trisomy twenty one better known as down syndrome is a condition that results from the presence of an extra copy or part of a copy of chromosome twenty one. Its the result of an error during cell division called non-disjunction. The risk of a baby being born with down syndrome increases with the mothers age, although what causes this correlation is still in question. Ninety percent of chromosome tweenty one trisomy was maternal, compared to only four percent being paternal. It is believed that telomere length attrition may be associated with the occurance of non-disjunction of chromosome twenty one during the stages of meiosis I and meiosis II.