PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
Male karyotype with trisomy 16. G-banded karyotype of a male patient with an extra chromosome 16, a condition known as trisomy 16. 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 16. The sex chromosomes (X and Y, bottom right) determine gender - here, the XY chromosome pair indicates that this person is male. Trisomy 16 is the most common trisomy leading to miscarriage and the second most common chromosomal cause of it, closely following X-chromosome monosomy. It is not possible for a child to be born alive with an extra copy.
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