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Keyword: morphology

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  • Kibble for Thought: Dog diversity prompts new evolution theory

    12/21/2004 8:45:42 AM PST · by PatrickHenry · 264 replies · 3,390+ views
    Science News ^ | 18 December 2004 | Christen Brownlee
    The wide range of variety in domesticated dogs — from the petite Chihuahua to the monstrous mastiff — has powered a new view of what drives evolution. Scientists have long known that the evolutionary changes that alter a species' appearance or create new species frequently occur in rapid bursts. One widely accepted theory holds that any evolutionary change results from a random switch of a single genetic unit within DNA. These single-point mutations occur in about 1 out of every 100 million DNA sites each generation. This frequency is too low to cause rapid evolutionary change, assert John W. Fondon...
  • Dogs Make Us Human

    03/26/2002 10:29:27 AM PST · by blam · 124 replies · 747+ views
    Australian Museum ^ | 3-25-2002 | Heidi De Wald
    Dogs make us human By Heidi De Wald Monday, 25 Mar, 2002 About 48% of Australian households own dogs. But can you imagine a world without dogs. And would we be the same if they were not here? Would human beings have developed in very different ways had our best friends not been by our sides? A recent study suggests that the domestication of dogs mutually led to profound changes in the biological and behavioural evolution of both species. It has long been known that the first species domesticated by humans was the wolf. In essence, we made wolves into...
  • The 'Birds Come First' hypothesis of dinosaur evolution

    06/15/2009 6:27:50 AM PDT · by SunkenCiv · 11 replies · 718+ views
    Tetrapod Zoology ^ | June 8, 2009 | Darren Naish
    Here, we look at a rather different proposal: the decidedly non-standard, non-mainstream Birds Come First (or BCF) hypothesis proposed by George Olshevsky. Rightly or wrongly, BCF has never been discussed in the technical literature (I have at least alluded to it in historiographical articles (Naish 2000a, b)), and all of George's articles on it have been in the 'grey' or popular literature (Olshevsky 1991, 1994, 2001a, b). Thanks, predominantly, to his activity on the dinosaur mailing list (a popular discussion list for dinosaur aficionados and researchers), George's BCF hypothesis was once well known and much discussed, and perhaps considered seriously...
  • Plant Evolution: Where’s the Root? ("Lack of data...shielded behind hope")

    04/18/2009 1:43:54 PM PDT · by GodGunsGuts · 20 replies · 961+ views
    CEH ^ | April 16, 2009
    Plant Evolution: Where’s the Root? April 16, 2009 — To Darwin, the origin of flowering plants was an “abominable mystery.” Recently, some entries on Science magazine’s blog Origins have claimed the mystery has been solved, at least partially, and a full solution is near at hand. Here is a great test case for evolution. Angiosperms comprise a huge, diverse population of organisms. There should be an ample fossil record, and many genes to decipher. Let’s see if the optimistic claims are rooted in evidence...
  • No Weaknesses in the Theory of Evolution?

    03/12/2009 8:31:17 AM PDT · by GodGunsGuts · 87 replies · 1,436+ views
    ICR ^ | March 12, 2009 | Frank Sherwin, M.A.
    No Weaknesses in the Theory of Evolution? by Frank Sherwin, M.A.* "There are no weaknesses in the theory of evolution." This was the testimony of Eugenie Scott to the Texas State Board of Education in January when the Board was debating new state science curriculum standards.1 Dr. Scott is Executive Director of the National Center for Science Education (NCSE), a watchdog group committed to exposing and ridiculing any group that questions the strange paradigm of Darwinism. Is it true "there are no weaknesses" in this particles-to-people worldview? Clearly, there is a very real problem with what biological molecules (DNA and...
  • Genealogy of scaly reptiles rewritten by new research

    11/23/2005 12:49:21 PM PST · by PatrickHenry · 238 replies · 3,173+ views
    EurekAlert (AAAS) ^ | 22 November 2005 | Barbara K. Kennedy
    The most comprehensive analysis ever performed of the genetic relationships among all the major groups of snakes, lizards, and other scaly reptiles has resulted in a radical reorganization of the family tree of these animals, requiring new names for many of the tree's new branches. The research, reported in the current issue of the journal C. R. Biologies, was performed by two biologists working at Penn State University: S. Blair Hedges, professor of biology, and Nicolas Vidal, a postdoctoral fellow in Hedges' research group at the time of the research who now is a curator at the National Museum in...
  • On Human Diversity: Why has the genetics community discarded so many phenotypes?

    10/25/2005 8:03:25 PM PDT · by Pharmboy · 61 replies · 1,777+ views
    The Scientist ^ | 10-24-05 | Armand M. Leroi
    HEAD CASES: The physical phenotypic differences between this Sudanese skull (right) and this European skull (left) are apparent. (From J.L.A. de Quatrefages, E.T. Hamy, Crania ethnica: les Cranes des races humaines, Baillere et fils: Paris, 1882.) Henry Flower became director of the British Museum of Natural History in 1884, and promptly set about rearranging exhibits. He set a display of human skulls to show their diversity of shape across the globe. A century later, the skulls had gone, and in their place was a large photograph of soccer fans standing in their terraces bearing the legend: "We are all...
  • More bones of hobbit-sized humans discovered

    10/11/2005 8:34:12 AM PDT · by aculeus · 89 replies · 2,871+ views
    Reuters ^ | October 11, 2005 | By Patricia Reaney
    LONDON (Reuters) - Australian scientists said on Tuesday they have discovered more remains of hobbit-sized humans which belong to a previously unknown species that lived at the end of the last Ice Age. Professor Mike Morwood, of the University of New England, in Armidale, Australia, stunned the science world last year when he and his team announced the discovery of 18,000-year-old remains of a new human species called Homo floresiensis. The partial skeleton discovered in a limestone cave on the remote Indonesian island of Flores in 2003 was of a tiny adult hominid, or early human, only one meter (3...
  • Anthropologists Uncover Ancient Jawbone

    10/11/2005 9:47:00 AM PDT · by NormsRevenge · 19 replies · 987+ views
    ap on Yahoo ^ | 10/11/05 | Joseph B. Verrengia - AP
    Scientists digging in a remote Indonesian cave have uncovered a jaw bone that they say adds more evidence that a tiny prehistoric Hobbit-like species once existed. The jaw is from the ninth individual believed to have lived as recently as 12,000 years ago. The bones are in a wet cave on the island of Flores in the eastern limb of the Indonesian archipelago, near Australia. The research team which reported the original sensational finding nearly a year ago strongly believes that the skeletons belong to a separate species of early human that shared Earth with modern humans far more recently...
  • The Problem With Evolution

    09/26/2005 5:44:09 AM PDT · by DARCPRYNCE · 340 replies · 6,041+ views
    ChronWatch ^ | 09/25/05 | Edward L. Daley
    Charles Darwin, the 19th century geologist who wrote the treatise 'The Origin of Species, by means of Natural Selection' defined evolution as "descent with modification". Darwin hypothesized that all forms of life descended from a common ancestor, branching out over time into various unique life forms, due primarily to a process called natural selection. However, the fossil record shows that all of the major animal groups (phyla) appeared fully formed about 540 million years ago, and virtually no transitional life forms have been discovered which suggest that they evolved from earlier forms. This sudden eruption of multiple, complex organisms is...
  • 'Your Forefathers Were Not Neanderthals'

    01/27/2004 8:08:04 AM PST · by blam · 338 replies · 4,077+ views
    IOL ^ | 1-26-2004 | Maggie Fox
    'Your forefathers were not Neanderthals' January 26 2004 at 02:30PM By Maggie Fox Washington - You may think your grandparents act like Neanderthals, but United States researchers said on Monday they had strong evidence that modern humans are not descended from them. A computer analysis of the skulls of modern humans, Neanderthals, monkeys and apes shows that we are substantially different, physically, from those early humans. New York University paleoanthropologist Katerina Harvati said Neanderthals should be considered a separate species from Homo sapiens, and not just a sub-species. "We interpret the evidence presented here as supporting the view that Neanderthals...
  • New four-winged feathered dinosaur?

    01/28/2003 1:54:40 PM PST · by ZGuy · 17 replies · 1,528+ views
    AIG ^ | 1/28/03 | Jonathan Sarfati
    Papers have been flapping with new headlines about the latest in a long line of alleged dinosaur ancestors of birds. This one is claimed to be a sensational dinosaur with feathers on its hind legs, thus four ‘wings’.1 This was named Microraptor gui—the name is derived from words meaning ‘little plunderer of Gu’ after the paleontologist Gu Zhiwei. Like so many of the alleged feathered dinosaurs, it comes from Liaoning province of northeastern China. It was about 3 feet (1 meter) long from its head to the tip of its long tail, but its body was only about the size...