SOVEREIGN - ISM / SCIENCE PHOTO LIBRARY SOVEREIGN - ISM / SCIENCE PHOTO LIBRARY
Female chromosomes in Down's syndrome. Karyotype showing the chromosomes from a cell of a female patient with Down's syndrome. Down's syndrome is a genetic disorder caused by the presence of all, or part of, a third copy of chromosome 21. It is associated with physical growth delays, characteristic facial features and mild to moderate intellectual disability.
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