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 o...
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http://en.wikipedia.org/wiki/Tetrasomy
(tet´rә-so″me) the presence of two extra chromosomes of one type in an otherwise diploid cell. adj., tetraso´mic., adj.
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http://www.encyclo.co.uk/local/21001
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