Down syndrome is a chromosomal disorder that results when a person inherits all or part of an extra copy of chromosome 21. This can occur in a variety of ways, the causes of which are unknown. The most common chromosomal abnormality that produces Down syndrome (accounting for 95% of all cases) is Trisomy 21, a defect in which an extra, third copy chromosome is present in every cell in the body. According to Parenting Magazine the number of …
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