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Title: Tetrasomy  
Author: World Heritage Encyclopedia
Language: English
Subject: Cat eye syndrome, Chromosome abnormality, Cytogenetics, Trisomy 16, Trisomy 22
Publisher: World Heritage Encyclopedia


Classification and external resources
ICD-10 Q97 - Q98
MeSH D000782

A tetrasomy is a form of aneuploidy with the presence of four copies, instead of the normal two, of a particular chromosome.



Full tetrasomy of an individual occurs due to non-disjunction when the cells are dividing (meiosis I or II) to form egg and sperm cells (gametogenesis). This can result in extra chromosomes in a sperm or egg cell. After fertilization, the resulting fetus has 48 chromosomes instead of the typical 46.

Autosomal tetrasomies

Sex-chromosome tetrasomies

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