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Bookmark or Share- Down Syndrome: Symptoms & Causes - Cleveland ClinicDown 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 their brain and body develop. People diagnosed with Down syndrome have happy and healthy lives with supportive care.
- Trisomy 18 (Edwards Syndrome): Symptoms, Causes, Diagnosis - WebMDTrisomy 18 is a condition where you have three copies of each chromosome 18 in your body's cells instead of two. This can lead to serious physical and mental disabilities.
- Trisomy 21 (Down Syndrome) - Children's Hospital of PhiladelphiaTrisomy 21 is the most common chromosomal anomaly in humans, affecting about 5,000 babies born each year and more than 350,000 people in the United States. Also known as Down syndrome, trisomy 21 is a genetic condition caused by an extra chromosome. Most babies inherit 23 chromosomes from each parent, for a total of 46 chromosomes.
- Trisomy: Types of Trisomy Disorders - Cleveland ClinicThe most common trisomy conditions include: Trisomy 13 (Patau syndrome). Trisomy 18 (Edward syndrome). Trisomy 21 ( Down syndrome ). In your genetic code, the 23rd pair of chromosomes are your sex cells that determine gender. Designations for sex cells are XX for female or XY for male, instead of as a number.
- Down syndrome - Symptoms and causes - Mayo ClinicAbout 95 percent of the time, Down syndrome is caused by trisomy 21 — the person has three copies of chromosome 21, instead of the usual two copies, in all cells. This is caused by abnormal cell division during the development of the sperm cell or the egg cell.
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