Sperm determines sex

As a rule, female promiscuity promotes sperm competition among males, and because the Y chromosome oversees sperm production, Dr. Individuals with these kinds of conditions are almost always sterile, and often suffer mild to severe developmental abnormalities.

In turtles and crocodiles, sex is determined by the temperature of the surrounding environment at a specific period in the development of a fertilized egg.

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More Information Is a home sperm test useful? Genetic testing.

See your GP if you have concerns about your son's development or you notice any troubling symptoms of Klinefelter syndrome in yourself or your son.

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