Chromosome 21 - Wikipedia
WEBChromosome 21 is the smallest human autosome with 215 genes and 45 million base pairs. It is involved in Down syndrome, Alzheimer's disease and other conditions related to its size and function.
Down syndrome - Symptoms and causes - Mayo Clinic
WEBMar 8, 2018 · Down syndrome is a genetic disorder caused by an extra copy of chromosome 21. It affects intellectual and physical development, and can cause health problems such as heart defects. Learn more about the types, risk factors and diagnosis of Down syndrome.
Chromosome 21 - MedlinePlus
WEBChromosome 21 is the smallest human chromosome with about 200 to 300 genes. It is involved in various genetic disorders, such as Down syndrome, leukemia, and ring chromosome 21, caused by changes in the number or structure of the chromosome.
Down Syndrome - StatPearls - NCBI Bookshelf - National Center …
WEBAug 8, 2023 · Down syndrome (trisomy 21) is a genetic disorder caused by the presence of all or a portion of a third chromosome 21. Patients typically present with mild to moderate intellectual disability, growth retardation, and characteristic facial features.
Down Syndrome: Symptoms & Causes - Cleveland Clinic
WEBDown syndrome is a genetic condition where a person has an extra copy of chromosome 21. It can affect their brain and body development and cause physical, cognitive and behavioral symptoms. Learn how to diagnose Down syndrome before or after birth.
Down syndrome - Wikipedia
WEBDown syndrome is a genetic disorder caused by the presence of an extra copy of chromosome 21. It is associated with developmental delays, intellectual disability, and characteristic physical features. Learn about the types, diagnosis, treatment, and prognosis of Down syndrome.
Trisomy 21 (Down Syndrome) - Children's Hospital of Philadelphia
WEBTrisomy 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 | Birth Defects | CDC - Centers for Disease …
WEBMay 16, 2024 · Down syndrome is a genetic condition where a person has an extra copy of chromosome 21. It can affect how their brain and body develop and cause physical and mental challenges. Learn about the types, risk factors, screening and diagnosis, and resources for people with Down syndrome.
Down Syndrome (Trisomy 21) - Down Syndrome (Trisomy 21)
WEBLearn about Down syndrome, a chromosome disorder caused by an extra chromosome 21 that affects intellectual and physical development. Find out the symptoms, diagnosis, treatment, and prognosis of this condition.
About Down Syndrome - National Human Genome Research …
WEBJun 29, 2017 · Down syndrome is a genetic disorder caused by an extra copy of chromosome 21. It affects learning, physical development, and health, and can be diagnosed by a blood or skin test. Learn more about the types, symptoms, diagnosis, and treatment of Down syndrome.
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