What factors might contribute to regional variations in Down syndrome prevalence?

Make an Appointment ... Down syndrome, also known as Trisomy 21, is the most common and readily identifiable chromosomal condition associated with intellectual ... Apr 20, 2023 ... The cause of Down syndrome is known to be an extra copy of chromosome 21, or trisomy 21. But because this chromosome contains more than 200 ... Down syndrome is the most common genetic cause of intellectual disability, affecting approximately 1 in every 700 children. It is named for John Langdon Down, ... The main cause of hospitalization was due to pneumonia in 50% of cases, followed by acute respiratory failure in 14%. Down syndrome is caused by an extra chromosome 21. Down syndrome affects people differently. It causes learning difficulties and health problems. Nov 30, 2023 ... In the United States, demographic factors also affect the risk for a child to be born with Down syndrome. These factors include geographic ... Due to weak muscle tone, the kneecaps of a child with Down syndrome may slip out of the groove. This instability will cause the knees to look deformed, but may ... Trisomy 21– More than 90% of Down syndrome cases are caused by trisomy 21. An extra chromosome (chromosome 21) originates in the development of either the sperm ... Jun 20, 2018 ... Down syndrome is a condition in which a person is born with an extra copy of chromosome 21. The condition is associated with intellectual disability. Trisomy 21, commonly known as Down syndrome, is a genetic disorder that causes intellectual disability, developmental delays, certain facial features, and ...