Your chromosomes control whether you're male or female. There are 23 pairs of chromosomes in every human body cell. the 23rd pair are lebelled XY. All men have X and a Y chromosome: XY The Y chromosome causes male characteristics. All Women have two X chromosomes: ** the lack of Y chromosome causes femal characteristics.
One Gene Determines which sex organs you develop. The gene that makes an embroy a male causes a protein called testis determing factor (TDF) to be produced.
When the embryo's reproductive system begin to develop, TDF causes the development of testes.
The testes produce a male sex hormones which makes you male. In females there is no TDF and so the embryo develops ovaries and the rest of a female reproductive system.
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