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RT @isocrime: the Y chromosome exists mainly so an embryo can check it once and go "should i make balls or not?" and to help make sperm. (a…
RT @isocrime: the Y chromosome exists mainly so an embryo can check it once and go "should i make balls or not?" and to help make sperm. (a…
RT @isocrime: the Y chromosome exists mainly so an embryo can check it once and go "should i make balls or not?" and to help make sperm. (a…
the Y chromosome exists mainly so an embryo can check it once and go "should i make balls or not?" and to help make sperm. (and even then, of the six factors you can use to induce random cells to become sperm-producing, only one is from the Y chromosome. h