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#151 COP15: the meeting to save life on Earth; anti-ageing properties of urine

The world, the universe and us

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Y Chromosome 3 Duplication in a Spiny Rat

In us mammals, it all comes down to the X and Y chromosomes. If an embryo inherits two X chromosomes, it develops into a female. If it inherits an X and a Y, it becomes male. The Y switches on genes that trigger the development of the testes. It's been losing genes over tens of millions of years. And in fact, often lost from cells as men age.

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