Most men are 46 XY. Rarely--or perhaps not so rarely--one out of 1000 baby boys have an extra-X chromosome. Their karyotypes, as seen above, are 47XXY.
These boys, most often, have totally normal appearances and grow up to be totally healthy men with normal male characteristics. Their only abnormalities are that they have very small testicles that do not produce sperm. These men are infertile.
While in the past these men were considered hopelessly infertile, now, due to advances in sperm detection procedures, fertility preservation, and assisted reproductive technologies, some of these men can now father their own biological children.
Exciting times indeed.
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