Down syndrome is a common genetic disorder. Down syndrome causes birth defects, medical problems, and some degree of intellectual disability.
Chromosomes contain the genetic makeup of your body. They occur in 23 pairs within the body. Down syndrome is a problem with chromosome pair 21. There is extra genetic material on the chromosome that may be caused by:
- An extra chromosome—This type is called Trisomy 21. This results from an error in cell division in the egg or sperm.
- Extra chromosomes in some cells—This type is called Mosaic Trisomy 21.
- Part of the chromosome breaking off and reattaching to another chromosome—This type is called translocation trisomy. In about one third of individuals, the translocation is inherited from a parent.
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.