Turner syndrome occurs when the baby is missing the second sexual chromosome (the embryo has chromosomes 45X0 instead of 46XY or 46XX). The resulting child will be a female with a few abnormalities.
Girls with Turner syndrome are sterile, and will not undergo puberty unless they are treated with hormones. They are often short and can have heart problems. Intelligence, however, is normal, although some have a tough time with math and spatial concepts.
This abnormality occurs in about 1 of 2,500 girls.
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