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Molecular assay reagents intended for use in identifying the abnormal situation in which both members of a chromosome pair are inherited from one parent (i.e., uniparental disomy [UPD]) and the other parent\'s chromosome for that pair is missing. UPD for some chromosomes is without consequence but, for a few chromosomes, can result in serious conditions including syndromes affecting growth and development. To date, only maternally derived chromosomes 7, 14, and 15 and paternally derived chromosomes 6, 11, 14, and 15 have been shown to have a definite phenotypic effect.
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