Down's Syndrome - Description



Chromosomes are structures that carry genetic information in cells. They carry the instructions that tell cells what functions they are to perform. They determine the way a person's body looks and the way it functions.

Cells normally carry two matched sets of twenty-three chromosomes for a total of forty-six chromosomes. One set of twenty-three chromosomes comes from each parent. Down's syndrome occurs when one chromosome pair is damaged. That pair is designated as chromosome #21.

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