Which specific genes on chromosome 21 are thought to be responsible for certain features of Down syndrome?

Down syndrome is a genetic disorder. It is also called trisomy 21. It includes certain birth defects, learning problems, and facial features. Down Syndrome (DS) refers to a genetic condition that is caused by an extra chromosome in the DNA chain on chromosome 21, referred to as Trisomy 21, ... Aug 8, 2023 ... Down syndrome (trisomy 21) is a genetic disorder caused by the presence of all or a portion of a third chromosome 21. Down syndrome is caused by an extra chromosome 21. Down syndrome affects people differently. It causes learning difficulties and health problems. 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. Aug 11, 2023 ... Blood disorders — Down syndrome can cause blood cell abnormalities, including a form of blood cancer called leukemia. Immune system problems — ... What Causes Down Syndrome-Like Symptoms in Cats? · Genetic Abnormalities: Cats can have their own unique genetic mutations that lead to physical and behavioral ... 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, ... Dec 26, 2024 ... Down syndrome is a condition in which a person has an extra copy of chromosome 21. Chromosomes are small "packages" of genes in the body's cells. Down syndrome happens when a person is born with an extra chromosome. Chromosomes determine how a baby's body forms and functions. · What causes Down syndrome?