Definition

Edwards syndrome is a genetic disorder caused by the presence of an
extra copy of chromosome 18 or by a portion of chromosome 18 translocated
(attached) to another chromosome plus two copies of chromosome
18. It is the second most common genetic disorder caused by a
trisomy, the most common being Down syndrome, or trisomy 21.
Edwards syndrome was first identified in 1960 by a British geneticist,
John H. Edwards (1928–2007), who analyzed blood samples taken from
a severely malformed baby who died in a British children’s hospital.

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