PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
Male karyotype with Down's syndrome. G-banded karyotype of a male patient with an extra chromosome 21, a condition known as trisomy 21, or Down's syndrome. The karyotype is the complete set of chromosomes in an organism. Human beings have 23 Chromosomes and normally there are two copies of each chromosome in each of our cells, one set from the mother and the other from the father. However, this person has three copies of chromosome 21. The sex chromosomes (X and Y, bottom right) determine gender - here, the XY chromosome pair indicates that this person is male. Down's syndrome is the most common chromosome abnormality in humans. It is typically associated with a delay in cognitive ability (learning disabilities) and physical growth, and a particular set.
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