
Down syndrome - Symptoms and causes - Mayo Clinic
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 …
Down Syndrome: Symptoms & Causes - Cleveland Clinic
Down syndrome is a genetic condition where a person is born with an extra copy of chromosome 21. This means that they have a total of 47 chromosomes instead of 46. This can affect how …
Down syndrome - Wikipedia
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 associated …
Down Syndrome: Causes, Types, and Symptoms - Healthline
Nov 28, 2023 · Down syndrome (sometimes called Down’s syndrome) is a condition in which a child is born with an extra copy of their 21st chromosome — hence its other name, trisomy 21. …
Down Syndrome: Symptoms, Causes, and Living With It
Jun 20, 2023 · Down syndrome is a lifelong genetic condition that begins to have effects before birth and can significantly impact many aspects of a person’s life. People who have Down …
Facts, Myths, & Truths About Down Syndrome - NDSS
Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21. This additional genetic material alters the course of development and causes the characteristics …
Down Syndrome | NICHD - NICHD - Eunice Kennedy Shriver …
Nov 30, 2023 · Down syndrome is a set of cognitive and physical symptoms that result from having an extra chromosome 21 or an extra piece of that chromosome. It is the most common …
About Down Syndrome | NICHD - NICHD - Eunice Kennedy Shriver …
Nov 22, 2023 · Down syndrome describes a set of cognitive and physical symptoms that result from an extra copy or part of a copy of chromosome 21. Chromosomes carry the genes that …
Down Syndrome - MedlinePlus
Jan 26, 2024 · Down syndrome is a condition in which a person has an extra chromosome or an extra piece of a chromosome. This extra copy changes how a baby's body and brain develop. …
Down Syndrome - Harvard Health
Feb 21, 2022 · Down syndrome is a disorder caused by a problem with the chromosomes — the pieces of DNA that have the blueprint for the human body. Normally a person has two copies …