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- 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 with developmental delays, mild to moderate intellectual disability, and characteristic physical features [1][13]
- Trisomy 21 (Down Syndrome) - Childrens Hospital of Philadelphia
What is Trisomy 21 (Down syndrome)? Trisomy 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
- Down Syndrome: Symptoms Causes - Cleveland Clinic
Trisomy 21 occurs when a developing fetus has three copies of chromosome 21 in every cell instead of the typical two copies This type makes up 95% of all cases of Down syndrome
- Down syndrome - Symptoms and causes - Mayo Clinic
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 changes and physical features of Down syndrome
- About Down Syndrome - National Human Genome Research Institute
Trisomy 21 means that each cell in the body has three copies of chromosome 21 instead of the usual two copies Having an extra number 21 chromosome interrupts the normal course of development, causing the characteristic clinical features of Down syndrome
- Down Syndrome: Trisomy 21, Causes, 6 Symptoms, 2 Tests . . . - MedicineNet
Down syndrome (trisomy 21) is most commonly caused by chromosome replication errors in which there are three copies of chromosome 21 instead of two A baby born with Down syndrome may have symptoms and signs such as unusual facial features, low IQ, and difficulty learning to walk and crawl
- Down Syndrome (Trisomy 21) in Children
Down syndrome is a genetic disorder It is also called trisomy 21 It includes certain birth defects, learning problems, and facial features A child with Down syndrome also may have heart defects and problems with vision and hearing How severe or mild these problems are varies from child to child
- Trisomy 21: What you need to know - Massachusetts General Hospital
Trisomy 21 (more commonly known as Down syndrome) is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21 Learn how it happens
- Down syndrome - Encyclopedia Britannica
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 chromosome 21 or an entire extra copy of chromosome 21, a condition known as trisomy 21
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