The most common chromosomal syndrome is _____

Trisomy 21 (Down&;s syndrome) is the most common chromosomal syndrome. Chromosomal disorders: These may involve autosomal or sex chromosomes. Involving autosomes Involving sex Chromosomes Down&;s syndrome (Trisomy 21) Edward syndrome (Trisomy 18) Patau syndrome (Trisomy 13) Cri du chat syndrome (5p deletion) Klinefelter syndrome (47,XXY) Turner syndrome (45,XO) Ref: Nelson textbook of pediatrics 21st edition Pgno: 659