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Larsen syndrome is a type of genetic disorder in which a person experiences a variety of symptoms, including things like the... wise GEEK clear answers for common questions
Down syndrome (also called trisomy 21) is a chromosomal disorder caused by the presence of all or part of an extra 21st chromosome. Since it is cause by having a *third* set of certain genes, it is not dominant or recessive in the usual sense of the word.