PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
Human karyotype with Turner syndrome. G-banded karyotype of a person who is lacking one of their sex chromosomes (X, Y), a condition known as Turner 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. The sex chromosomes (X and Y, bottom right) determine gender. Here, the person only has a single X chromosome, where a normal karyotype would contain either XX (female) or XY (male). Turner syndrome causes a number of physical abnormalities including short stature, a broad chest and low-set ears, and typically causes infertility.
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