Down syndrome

Down syndrome or trisomy 21 (usually Down's Syndrome in British English[1]) is a genetic disorder caused by the presence of all or part of an extra 21st chromosome.

Down syndrome (also called Down's syndrome) encompasses a number of genetic disorders, of which trisomy 21 (a nondisjunction) is the most representative, causing highly variable degrees of learning difficulties and physical disabilities.

Down Syndrome (Trisomy 21)
Down syndrome is a genetic disease resulting from a chromosomal abnormality. An individual with Down syndrome inherits all or part of an extra copy of Chromosome 21.

Down syndrome An inherited condition caused by having an extra copy of chromosome 21. See aneuploidy.

Down syndrome
A human genetic disease resulting from having an extra chromosome 21, characterized by mental retardation and heart and respiratory defects.
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Down Syndrome
Down syndrome is trisomy 21. It is characterized by mental retardation, an abnormal pattern of palm creases, a flat face, sparse, straight hair, and short stature.

DOWN SYNDROME (TRISOMY 21) CHILD
KARYOTYPE OF TRISOMY 21 FEMALE
The rate of non disjunction is correlated with maternal age. The probability of a woman having a fetus with a chromosome defect increases with age.

Down syndrome. A congenital syndrome including mental retardation, caused by the cells in a person's body having an extra chromosome 21; also called trisomy 21.
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Down syndrome, Turner syndrome). Angelman syndrome -- a condition characterized by severe mental deficiency, developmental delay and growth deficiency, puppet-like gait and frequent laughter unconnected to emotions of happiness.

[More] DNase I DollyFirst mammal (a sheep) cloned from an adult cell [more] Domains, protein Dopamine[as hormone] [as neurotransmitter] Dose-response relationships Double-stranded breaks (DSBs) in DNA Doubling times Down syndrome (trisomy 21) ...

Down Syndrome Information
European chromosome 11q network For parents/caretakers to contact each other, collect information about these rare anomalies, and to follow the latest scientific developments
Family Village: Rare Genetic Diseases ...

The nuchal translucency test is used to determine if a woman is at high risk of having a baby with a chromosomal abnormality, such as Down syndrome.
Nucleotide ...

This forms cells with either too many (possibly one or more single or sets of chromosomes too many) or too few chromosomes. Thought to be a common cause for Down Syndrome, where sufferers often have an extra copy of chromosome 21.

See also: Organ, Human, Chromosome, Trans, DNA