What makes a boy or a girl?

Your eggs all have one ''X'' chromosome each (women are XX, ie have two X chromosomes). Each sperm carries either an ''X'' or a ''Y''. If an X sperm meets an X egg, the result is XX=female. If a Y sperm meets an X egg, teh answer is XY=male. In quite rare circumstances, there are other possiblities, such as X on its own (Turner''s syndrome), XYY, XXY or XXX.

X and Y sperm
The diagram shows the penetration of two eggs by sperm containing either an X or a Y chromosome. The egg always has an X chromosome, so an X produces a girl, a Y sperm, a boy.

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What makes a boy or a girl?

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