Numerical disorders
A chromosomal number that is an exact multiple of the haploid number of 23 chromosomes in humans, and exceeds the diploid number of 46 chromosomes is called polyploidy. A state with a chromosomal number not an exact multiple of haploid's is called aneuploidy.
Examples of numerical disorders are:
- 92, XXYY tetraploidy
- 69, XXY triploidy
- 47, XX, (21) trisomy 21
- 47, XY, (18) trisomy 18
- 47, XX, (16) trisomy 16
- 47, XX, (13) trisomy 13
- 47, XXY Klinefelter's syndrome
- 47, XXX Trisomy X
- 45, X Turner's Syndrome
- 49, XXXXY Klinefelter's variant
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