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===Pimary Sexual Differentiation Phase===
 
===Pimary Sexual Differentiation Phase===
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This phase represents the initial phase of differentiation of reproductive tissues. The male Y chromosome in mammals contains genetic code that results in the production of '''testes-determining factor (TDF)''' which is responsible for causing the gonads to develop into testes. In the female fetus, TDF is not produced as there is no Y chromosome and therefore the gonads develop into ovaries.
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===Secondary Sexual Differentiation Phase===
 
===Secondary Sexual Differentiation Phase===
  
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