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Platypus sex chromosomes








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how many sex chromosomes does a platypus have. The xx xy sex-determination system is the most familiar, as it is found in diocesisdecanarias.info xx xy system is found in most other mammals, as well as some diocesisdecanarias.info this system, most females have two of the same kind of sex chromosome xx, while most males have two distinct sex chromosomes diocesisdecanarias.info the.

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The researchers worked out the make-up of platypus sex chromosomes by using fluorescent markers to stain chromosomes in platypus cells before examining them under a microscope.

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The platypus sex chromosome complex is, therefore, not a link between the bird and mammal systems as previously proposed (Grützner et al. ) but is, in fact, derived from a chromosome with homology with a region on the bird Z and human associated regions (Fig. 4).

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Results. Chromosome painting reveals a meiotic chain of nine sex chromosomes in the male echidna and establishes their order in the chain. Two of those differ from those in the platypus, three of the platypus sex chromosomes differ from those of the echidna and the order of several chromosomes is rearranged.

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The platypus has an extraordinary sex chromosome complex, in which five X and five Y chromosomes pair in a translocation chain of alternating X and Y chromosomes. We used physical mapping to.

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Platypus sex involves venomous battles, tail biting and courtship dances.


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The platypus has an extraordinary sex chromosome complex, in which five X and five Y chromosomes pair in a translocation chain of alternating X and Y chromosomes. The platypus isn't just weird for being duck-billed, venomous and a mammal that lays eggs—it has weird genetics too. Most mammals have two sex chromosomes, but the platypus has ten!

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The platypus has ten sex chromosomes; males have an XYXYXYXYXY pattern while females have ten X chromosomes. Although it is an XY system, the platypus' sex chromosomes share no homologues with eutherian [which includes human] sex chromosomes. The unusual sex chromosomes of platypus are not homologous to the human X and Y chromosomes, implying that the sex chromosomes of placental mammals evolved after the monotreme and placental mammal lineages split about million years ago.

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RESULTS: Chromosome painting reveals a meiotic chain of nine sex chromosomes in the male echidna and establishes their order in the chain. Two of those differ from those in the platypus, three of the platypus sex chromosomes differ from those of the echidna and the order of several chromosomes is rearranged. Mammal sex determination depends on an XY chromosome system, a gene for testis development and a means of activating the X chromosome. The duckbill platypus challenges these dogmas.(1,2) Gutzner.

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Description:The evolution of heteromorphic sex chromosomes is accompanied by the establishment of regional dosage compensation in birds (Melamed and Arnold )or chromosome-wide dosage compensation mechanisms in the homogametic sex in birds and mammals and meiotic sex chromosome silencing in the heterogametic sex in mammals (Heard and Disteche ). The platypus has ten sex chromosomes; males have an XYXYXYXYXY pattern while females have ten X chromosomes. Although it is an XY system, the platypus' sex chromosomes share no homologues with eutherian sex chromosomes. Platypus loaded with sex chromosomes, Science Online, 25 Oct Platypus sex The gene that most likely determines the sex of the platypus and echidna has been identified by Australian and Swiss.
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