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Trisomy 21 (Down Syndrome) (male) karyotype
Down syndrome or trisomy 21 is caused by nondisjunction of chromosome 21 in a parent who is chromosomally normal and is one of the most common chromosomal abnormalities in liveborn children. The normal human karyotypes contain 22 pairs of autosomal chromosomes and one pair of sex chromosomes, this small image indicates the extra chromosome with a red arrow.
The karyotype is the characteristic chromosome complement as identified by staining and can only be identified during cell division when chromosomes are folded.
The chromosomes when organised as an image in sequence are called a karyogram or idiogram.
Image Source: UNSW Embryology http://embryology.med.unsw.edu.au/Defect/page21.htm
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:18, 27 July 2009 | | 200 × 175 (5 KB) | MarkHill (talk | contribs) | Down syndrome or trisomy 21 is caused by nondisjunction of chromosome 21 in a parent who is chromosomally normal and is one of the most common chromosomal abnormalities in liveborn children. Image Source: UNSW Embryology http://embryology.med.unsw.edu.au |
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