People with Down syndrome have an extra copy of chromosome 21, for a total of 47 chromosomes.

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People with Down syndrome have an extra copy of chromosome 21, for a total of 47 chromosomes. However, in a few cases of Down syndrome, 46 chromosomes are present. This total includes two normal-looking chromosomes 21, one normal chromosome 14, and a longer-than-normal chromosome 14. Interpret this observation. How can these individuals have 46 chromosomes?

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Human Biology

ISBN: 9781305264540

11th Edition

Authors: Cecie Starr, Beverly McMillan

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