PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
Male karyotype with trisomy 13. R-banded karyotype of a male patient with an extra chromosome 13, a condition known as trisomy 13, or Patau 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 13. The sex chromosomes (X and Y, bottom right) determine gender - here, the XY chromosome pair indicates that this person is male. The extra genetic material from chromosome 13 disrupts the normal course of development, causing multiple and complex organ defects.
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