Thelansis

 Down Syndrome is a chromosomal disease characterized by intellectual disability, a distinctive facial appearance, and low muscle tone (hypotonia) in infancy. Although all affected people experience cognitive delays, the intellectual disability is usually mild to moderate. People with DS may have a variety of congenital disabilities. A heart defect affects approximately half of all affected children. Digestive abnormalities, such as intestine blockage, are less common. Individuals with DS are at a higher risk of developing various medical conditions. These include gastroesophageal reflux, a backflow of acidic stomach contents into the esophagus, and celiac disease, a gluten intolerance. Trisomy 21 (nondisjunction) is the most ordinary type of Down syndrome, accounting for 95 percent of cases. Babies are typically born with 23 chromosome pairs (or 46 total chromosomes) in each cell, one inherited from the mother and father. In Trisomy 21, an error in cell division is called “nondisj...