Q98: Other sex chromosome abnormalities, male phenotype, not elsewhere classified
Q98.7: Male with sex chromosome mosaicism
When beginning its development, every single cell in the body contains a complete blueprint of the body. This blueprint consists of genetic information. The genetic information is encrypted in the chromosomes. Every human cell normally contains 23 chromosome pairs, i.e. a total of 46 chromosomes.
The X chromosome and the Y chromosome determine a person’s biological gender. Men normally have one X chromosome and one Y chromosome. Women normally have 2 X chromosomes.
There are cells in your body that have different numbers of X chromosomes and Y chromosomes. You may have body cells with 2 Y chromosomes, for example. Other body cells may, for example, only have 1 Y chromosome and 2 X chromosomes or 3 Y chromosomes at the same time. This is called Mosaic Down syndrome, or mosaicism.
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