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Down syndrome is a genetic disorder in which a person is born with an extra copy of chromosome 21. There are three genetic variations that cause Down syndrome: Trisomy 21, Mosaic Trisomy 21 or Translocation Trisomy 21. There are many ways in which theses disorders affect the body.
Trisomy 21 occurs when an egg or sperm comes in with an extra copy of chromosome 21, then, once an embryo is formed and starts to develop, the chromosome is replicated in every single cell of the embryo. Trisomy 21 is the most common type of Down syndrome. About 92% of Down syndrome patients have this type. People with Trisomy usually have physical problems.
Mosaic Trisomy 21 happens when an egg or sperm come in with an extra copy of chromosome 21, then, once an embryo is formed and starts to develop, the chromosome is replicated in some of the cells. In Mosaic some cells have a normal number of chromosomes and some have an extra chromosome 21. Mosaic Trisomy 21 occurs in 2-3% of patients with Down......

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