What is a chromosome disorder?
A chromosome disorder results from a change in the number or structure of chromosomes.Error in the number of chromosomes (too many or too few) includes the following disorders: Down's syndrome or trisomy 21: The individual has an extra chromosome 21. Trisomy 18 or Edwards's syndrome: The individual has an extra chromosome 18. Trisomy 13 or Patau syndrome: The individual has an extra chromosome 13.
| Syndrome | Abnormality | Incidence |
|---|---|---|
| Down’s | Trisomy 21 | 15 in 10,000 |
| Edwards’ | Trisomy 18 | 3 in 10,000 |
| Patau’s | Trisomy 13 | 2 in 10,000 |
| Turner | Monosomy X | 2 in 10,000 (female births) |
| Klinefelter’s | XXY | 10 in 10,000 (male births) |
| XXX | XXX | 10 in 10,000 (female births) |
| XYY | XYY | 10 in 10,000 (male births) |
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