Platypus sex chromosomes

The genetic information that creates a yellow coat comes from another pair of genes altogether. As the long-time Director of the Cold Spring Harbor Laboratory he continued to lead the way in genetic research. Platypuses are famous for laying eggs yet producing milk, having a bird-like bill and a skeleton with reptilian features. Platypus chromosome 3 contains homologues of genes localized on chicken Z and human 5 and Similarly, homologous regions were not determined for short regions on Tac 3p, 4p, 5p, 6p, 8p, 13p, 15q, 16p, 17q, 18, 20, 21, 23, 24p and the large regions on 1q and 2q. We show here that several other genes with homologues on the chicken Z also map to the platypus X 5. DNA damage is part of the reason we grow older.
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Extraordinary Diversity: Unusual Sex Chromosomes of Platypus, Emu and Duck

Other unusual systems include those of the swordtail fish [ clarification needed ] ; [11] the Chironomus midges [ clarification needed ] [ citation needed ] ; the juvenile hermaphroditism of zebrafish , with an unknown trigger; [11] and the platyfish , which has W, X, and Y chromosomes. ScienceDaily, 7 January However, homologues to the avian DMRT1 gene on platypus sex chromosomes X3 and X5 suggest that it is possible the sex-determining gene for the platypus is the same one that is involved in bird sex-determination. In this system, most females have two of the same kind of sex chromosome XX , while most males have two distinct sex chromosomes XY. From Wikipedia, the free encyclopedia. Retrieved 25 October
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Extraordinary Diversity: Unusual Sex Chromosomes of Platypus, Emu and Duck

University of Sydney. Main article: ZW sex-determination system. ZME Science. This provides a great system to understand how sex chromosomes evolve in their early phase -- and in the case of Pekin duck, in the middle phase. Wikimedia Commons has media related to Ornithorhynchus anatinus.
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ZW sex-determination system

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Description: University of Tasmania. Zoo Victoria. They are the only sexually heteromorphic family among the trematode class, and depend on remaining biochemically paired in copula to complete their life cycle. Ferganodon Klamelia.

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