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X and Y Spermatozoa


A HUMAN spermatozoon contains an X or a Y chromosome, whereas every human egg contains an X chromosome. If, therefore, an X spermatozoon fertilizes an egg, the offspring is female; but if a Y spermatozoon fertilizes an egg, the offspring is male.

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ROTHSCHILD X and Y Spermatozoa. Nature 187, 253–254 (1960).

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