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Open AccessThe multiple sex chromosomes of platypus and echidna are not completely identical and several share homology with the avian Z
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 temperat...
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Article
Open AccessDisruption and pseudoautosomal localization of the major histocompatibility complex in monotremes
The monotremes, represented by the duck-billed platypus and the echidnas, are the most divergent species within mammals, featuring a flamboyant mix of reptilian, mammalian and specialized characteristics. To u...