Down syndrome (Trisomy 21) is a genetic disorder that is caused by a failure of cells to ____. a Complete the cell cycle b Initiate mitosis c Initiate the cell cycle d Undergo proper chromosomal segregation during meiosis e Undergo the S phase of the cell cycle Check Answer Copy link Down syndrome (Trisomy 21) is a genetic disorder that has three copies of chromosome 21 resulting from improper chromosomal segregation during meiosis. Cell Biology General Biology Genetics ← Previous Random Next →