澳门金沙游戏官方网站:Singularly sexed


THE sex of male vertebrates depends on a single gene. Mammals become male if they have X and Y chromosomes, while male birds need two Z chromosomes and alligators only become male if their egg is the right temperature. But these switches all funnel into one gene, says Andrew Sinclair of the University of Melbourne. He and his colleagues found that one gene, DMRT1, only works in the developing testes of male mice, chicks and alligators (Nature, vol 402,
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