An extra copy of chromosome 21, a condition called_________ syndrome, occurs in about 1 of every 700 births, although this rate varies tremendously with the age of the parents.

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The Answer of An extra copy of chromosome 21, a condition called_________ syndrome, occurs in about 1 of every 700 births, although this rate varies tremendously with the age of the parents.

An Extra Copy of Chromosome 21, a Condition Called_________ Syndrome