Nov 12, 2024 · Down syndrome is a genetic condition caused when an unusual cell division results in an extra full or partial copy of chromosome 21. This extra genetic material causes the developmental …

Jun 11, 2012 · Sometimes, a parent who does not have Down syndrome may carry a translocation in chromosome 21 that can be passed on to children and cause Down syndrome. Studying the parents’ …

Down syndrome is a genetic condition where a person has an extra copy of chromosome 21 for a total of 47 chromosomes instead of 46.

Dec 26, 2024 · What it is 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, which determine …

Down syndrome ... Down syndrome or Down's syndrome, [12] also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually …

Jun 25, 2025 · Down syndrome affects an estimated one in 800 births. It's the most common chromosome problem seen in live births. Symptoms of Down syndrome In addition to the …

Feb 23, 2024 · People with Down syndrome have an extra chromosome that impacts their looks and their ability to think, learn, and reason. Discover the type, causes, and kinds of effects it can have.

Down SyndromeDown Syndrome What Is Down Syndrome? Down syndrome is a chromosomal abnormality. A person with Down syndrome has three copies of chromosome 21, instead of the usual …

Nov 28, 2023 · Down syndrome is the most common genetic condition in the United States. We’ll explain the causes, symptoms, and outlook of this condition.

Explore the causes of Down syndrome, including Trisomy 21, Mosaicism, and Translocation, plus risk factors, diagnosis, and treatment options.