Question

write a brief note on each a.Down syndrome

Answer 1

Down syndrome (DS or DNS), also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21.[2] It is typically associated with physical growth delays, characteristic facial features and mild to moderate intellectual disability.[1] The average IQ of a young adult with Down syndrome is 50, equivalent to the mental ability of an 8- or 9-year-old child, but this can vary widely.[