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Tetrasomy
Specialty Medical genetics

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

Causes

Full

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

External links