PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
Male karyotype with trisomy 9. G-banded karyotype of a male patient with an extra chromosome 9, a condition known as trisomy 9. 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 9. The sex chromosomes (X and Y, bottom right) determine gender - here, the XY chromosome pair indicates that this person is male. The symptoms vary, but usually result in dysmorphisms (differences in structure) of the skull and nervous system, and learning disabilities.
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