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Platypus sexGenome Biol. The multiple sex chromosomes of platypus and echidna are not completely identical and several share homology with the avian Z. Author information: Sex-determining systems have evolved independently in vertebrates. Placental mammals and marsupials have an XY system, birds have a ZW system. Reptiles and amphibians have different systems, including temperature-dependent sex determination, and XY and ZW systems that differ in origin from birds and placental mammals. Monotremes diverged early in mammalian evolution, just after the mammalian clade diverged from the sauropsid clade.The multiple sex chromosomes of platypus and echidna are not completely identical and several share homology with the avian Z. Rens W(1), O'Brien PC. Everyone knows that the duck-billed platypus is pretty strange. But it seems this mammal's eccentricities extend beyond its famous bill, and. The platypus (Ornithorhynchus anatinus), sometimes referred to as the duck- billed platypus, .. Though the platypus lacks the mammalian sex-determining gene SRY, a study found that the mechanism of sex determination is the AMH gene on...the end of the story look at the video above ↑ ↑ ↑

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