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Sex Determination in mammals Introduction Mammals are large animals with long life cycles. They produce relatively few gametes and so use sexual reproduction to increase variation in order to adapt to environmental conditions with the maximum efficiency. As organisms have become larger and taken the form of the mammals we see today, a greater specialisation within each sex becomes an advantage; one member usually concentrating on producing energy-expensive eggs whilst the others produce large quantities of sperm. This process cumulates in the mammalian system of viviparity, when the embryo develops inside the female and the male will usually provide them both with food. With this increasing investment in young the potential dangers of inbreeding increase and the greater the need for mechanisms to insure outbreeding. In this presentation we plan to highlight how the genes involved in the determination of the different sexes work to ensure that the highly conserved mechanisms...

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