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What is trisomy 21 chromosome?
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Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is usually associated with developmental delays, mild to moderate intellectual disability , and characteristic physical features.
- Third copy of chromosome 21
- Mostly at conception, rarely after fertilization
- Overview
- Symptoms
- Causes
- Risk Factors
- Complications
- Prevention
Down syndrome is a genetic disorder caused when abnormal 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. Down syndrome varies in severity among individuals, causing lifelong intellectual disability and developmental delays. ...
Each person with Down syndrome is an individual — intellectual and developmental problems may be mild, moderate or severe. Some people are healthy while others have significant health problems such as serious heart defects. Children and adults with Down syndrome have distinct facial features. Though not all people with Down syndrome have the same f...
Human cells normally contain 23 pairs of chromosomes. One chromosome in each pair comes from your father, the other from your mother. Down syndrome results when abnormal cell division involving chromosome 21 occurs. These cell division abnormalities result in an extra partial or full chromosome 21. This extra genetic material is responsible for the...
Some parents have a greater risk of having a baby with Down syndrome. Risk factors include: 1. Advancing maternal age.A woman's chances of giving birth to a child with Down syndrome increase with age because older eggs have a greater risk of improper chromosome division. A woman's risk of conceiving a child with Down syndrome increases after 35 yea...
People with Down syndrome can have a variety of complications, some of which become more prominent as they get older. These complications can include: 1. Heart defects.About half the children with Down syndrome are born with some type of congenital heart defect. These heart problems can be life-threatening and may require surgery in early infancy. ...
There's no way to prevent Down syndrome. If you're at high risk of having a child with Down syndrome or you already have one child with Down syndrome, you may want to consult a genetic counselor before becoming pregnant. A genetic counselor can help you understand your chances of having a child with Down syndrome. He or she can also explain the pre...
Learn about the causes, symptoms, diagnosis and treatment of trisomy 21, the most common chromosomal anomaly in humans. Find out how to care for your child with Down syndrome at CHOP, a leading center for comprehensive and collaborative care.
Oct 10, 2023 · Down syndrome is also referred to as Trisomy 21. This extra copy changes how the baby’s body and brain develop, which can cause both mental and physical challenges for the baby. People with Down syndrome usually have an IQ (a measure of intelligence) in the mildly-to-moderately low range and are slower to speak than other children.
Mar 21, 2024 · Trisomy 21, also known as Down syndrome, is a condition characterized by a distinctive pattern of minor and major anomalies associated with excess chromosome 21 material. Key findings in trisomy 21. Physical traits – include upslanting palpebral fissures, flat nasal bridge and midface, decreased muscle tone (hypotonia), wider space between ...
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.
Down syndrome is a genetic condition in which a child has an extra copy of chromosome 21, affecting certain genes and characteristics. Learn about the types, symptoms, and resources of Down syndrome, including trisomy 21, the most common type of Down syndrome.
