Q92: Other trisomies and partial trisomies of the autosomes, not elsewhere classified
Q92.0: Whole chromosome trisomy, meiotic nondisjunction
Somatic cells usually hold a complete blueprint of your body. This blueprint consists of genetic information. The genetic information is encrypted in the chromosomes. In humans, somatic cells usually have 23 pairs of chromosome, so 46 chromosomes in all. Apart from the male sex chromosomes, each chromosome is normally present twice per cell.
The chromosomes are passed on to the child by both parents. To this end, the chromosomes are in the mother’s egg cell and the father’s sperm cell. When the egg cell and the sperm cell merge, a new cell forms. Then, from this cell, the cells for a new body form.
It may happen that a chromosome is present in each cell of the body three times instead of twice. This is called trisomy. Trisomy can occur if there were more chromosomes than usual in the egg or sperm cell. The symptoms can vary depending on which chromosome is affected. The child has trisomy, leading to severe developmental disorders when developing in the womb. Children with this kind of trisomy usually cannot survive.
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