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 …

Down syndrome occurs because of changes in the way cells in chromosome 21 divide. Every person with Down syndrome has an extra chromosome 21 in some or all of their cells.

What causes Down syndrome? Down syndrome is caused by a random error in cell division that results in the presence of an extra copy of chromosome 21. The type of error is called nondisjunction.

Jan 8, 2026 · 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 how the body …

Down syndrome or sometimes 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]

6 days ago · Down syndrome is a genetic condition that causes mild to significant physical and developmental problems. People with Down syndrome (DS) are born with an extra chromosome. …

Jan 8, 2026 · Down syndrome is a genetic condition caused by an extra copy of chromosome 21. Risk factors for Down syndrome include advanced parental age and family history. People with Down …

5 days ago · Down syndrome, congenital disorder caused by the presence in the human genome of extra genetic material from chromosome 21. The affected individual may inherit an extra part of …

Down syndrome occurs because of the extra copy of chromosome 21, which can cause the body and brain to develop differently than a child without the syndrome.

Apr 6, 2025 · In most cases, Down syndrome occurs when there is an extra copy of chromosome 21. This form of Down syndrome is called trisomy 21. The extra chromosome causes problems with the …