The Sound of a Nested Hierarchy Shattering

_{November 28, 2006

Intelligent Design}

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Chromosomal sex determination in the platypus discovered to be a combination of mammal and bird systems. The resemblance to birds is now more than just superficial.

http://www.newscientist.com/article.ns?id=dn6568

Comments

Knock, knock. Urchin. Urchin who? Urchin ya want to know why they put me and Tube Worms in the Kingdom Animalia? Uhhh no, but the Tree is pretty.Michaels7_{November 28, 2006
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Talk.Origins is looking stupid:
Anyone who reads any evolutionary literature, even at a basic level, will quickly find out that birds are thought to have evolved from dinosaurs in the Jurassic about 150 million years ago, and that mammals are thought to have evolved from a reptile-like group of animals called the therapsids in the Triassic about 220 million years ago. No competent evolutionist has ever claimed that platypuses are a link between birds and mammals.
Oops.Jehu_{November 28, 2006
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Actually, the Baraminology Study Group, especially Kurt Wise, do not view it as a shattering of nested hierarchies, but the existence of multiple hierarchies! Wise was right on!!! Another triumph from the anti-Darwinists. Salscordova_{November 28, 2006
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While you are trying to resolve the montreme, bird, reptile, mammal tree. Check out this review which explains that the tree of life will likely never be resolveable no matter how much data is collected. http://biology.plosjournals.org/perlserv/?request=get-document&doi=10.1371%2Fjournal.pbio.0040352Jehu_{November 28, 2006
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The platypus is a way cool critter. I use one as an avatar on certain other boards when I argue for design; I think it was designed by a committee :). (Or Someone with a great sense of humor.)dacook_{November 28, 2006
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Fascinating. From an abstract of an earlier article in 2003
Within the last 40 years, more and more details of monotreme physiology, histology, reproduction and genetics have been revealed. Some show similarities with birds or reptiles, some with therian mammals, but many are very specific to monotremes. The genome is no exception to monotreme uniqueness. An early opinion was that the karyotype, composed of a few large chromosomes and many small ones, resembled bird and reptile macro- and micro-chromosomes. However, the platypus genome also features characteristics that are not present in other mammals, such as a complex translocation system. The sex chromosome system is still not resolved.
From the Nature abstract in 2004
The largest X chromosome, with homology to the human X chromosome, lies at one end of the chain, and a chromosome with homology to the bird Z chromosome lies near the other end. This suggests an evolutionary link between mammal and bird sex chromosome systems, which were previously thought to have evolved independently.
Jehu_{November 28, 2006
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