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Author | Topic: Mankind and dinosaur side by side ? ? | |||||||||||||||||||||||
mark24 Member (Idle past 5221 days) Posts: 3857 From: UK Joined: |
quote: Are you sure something as large as Brachiosaurus, Diplodocus, Apatasaurus can run 30 mph? Let alone 70 mph.
quote: 1/ Stasis is not precluded in evolutionary theory. See Punctuated EQUILIBRIUM. 2/ Transitional species.
http://www.cs.colorado.edu/~lindsay/creation/ring_species.html There are several ring species, but the most famous example is the herring gull. In Britain, these are white. They breed with the herring gulls of eastern America, which are also white. American herring gulls breed with those of Alaska, and Alaskan ones breed with those of Siberia. But as you go to Alaska and Siberia, you find that herring gulls are getting smaller, and picking up some black markings. And when you get all the way back to Britain, they have become Lesser Black-Backed Gulls. So, the situation is that there is a big circle around the world. As you travel this circle, you find a series of gull populations, each of which interbreeds with the populations to each side. But in Britain, the two ends of the circle are two different species of bird. The two ends do not interbreed: they think that they are two different species.
http://www.tulane.edu/~guill/rassenkreis_module.html Ring species (Rassenkreis, a group of races) are individual species which have a number of subspecies or races occurring in a circular or ring-shaped pattern. The subspecies at the ends of the ring act like good species and are morphologically quite distinct from one another. The subspecies in between the two extremes form an almost continuous set of intermediate forms. You can imagine that this phenomenon must give taxonomists fits--and especially anyone with a typological mind (tee hee!). How does one designate different species in the face of such a situation? An example of such a species is the plethodontid salamander Ensatina eschscholtzii of western North America. There are seven subspecies in the species. The blotched and unblotched forms at the southern end of the ring in southern California behave like separate species, but there are not any species borders between populations to the north. Wake and Yanev (1986, Evolution: 40: 702-715) studied allozyme variation within and among the subspecies of this ring species in an attempt to gain an understanding of the genetic differentiation in the species. They found considerable allozymic differentiation among populations; genetic distances (Nei's index of genetic distance, D) were greater than those between some other sympatric species of pletodontid salamanders in the region. So, as you can see, species origins are not like a car production line, where one make stops & another begins. When species evolve they do so as a POPULATION, with all (actually, most) members of that population able to interbreed with every other member of the opposite sex, the whole population moves adaptively as a body, so there is NO first member of a species as such. The longer they are separated from a parent population, the less likely they will be able to produce fertile offspring, even though they may still be able to mate with an intermediary population that is fertile to both. 3/ The question no creationist ever answers. What would you accept as a transitional? Mark [edited to fix link][edited to add 3/] ------------------ Occam's razor is not for shaving with. [This message has been edited by mark24, 04-10-2002] [This message has been edited by mark24, 04-12-2002]
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mark24 Member (Idle past 5221 days) Posts: 3857 From: UK Joined: |
Mister Pamboli,
Great minds think alike Mark ------------------Occam's razor is not for shaving with.
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mark24 Member (Idle past 5221 days) Posts: 3857 From: UK Joined: |
quote: Where in the hell did the Gull come from? What about completely functional forelimbs that lent themselves to a few seconds gliding. This being selected for, ending up in flight? Since you ask "Where are your transitional species ?, I repeat, what would you accept as a transitional? Mark ------------------Occam's razor is not for shaving with.
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mark24 Member (Idle past 5221 days) Posts: 3857 From: UK Joined: |
quote: Tell you what, since I asked first, why don't you answer me, then I'll answer you, deal? Since you ask "Where are your transitional species ?, I repeat, what would you accept as a transitional? Mark ------------------Occam's razor is not for shaving with.
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mark24 Member (Idle past 5221 days) Posts: 3857 From: UK Joined: |
quote: I never posed the question ""Where are your transitional species ?". I do ask what criteria creationists apply to potential transitionals to know that they don't exist. Because creationists DO "know" transitionals don't exist, just wondering how. Mark ------------------Occam's razor is not for shaving with. [This message has been edited by mark24, 04-14-2002] [This message has been edited by mark24, 04-14-2002]
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mark24 Member (Idle past 5221 days) Posts: 3857 From: UK Joined: |
quote: I'll ask again, what would you accept as a transitional? Please note, I DID NOT ask what you wouldn't accept. If I could be cheeky, & add to that, what criteria would you apply to all fossils to determine whether they are transitional or not? Mark ------------------Occam's razor is not for shaving with. [This message has been edited by mark24, 04-15-2002] [This message has been edited by mark24, 04-15-2002]
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mark24 Member (Idle past 5221 days) Posts: 3857 From: UK Joined: |
quote: Techristian, I would accept God coming down to earth, & performing miracles under lab conditions as evidence of a SUPREME CREATOR. I'll ask again, what would you accept as a transitional? Please note, I DID NOT ask what you wouldn't accept. If I could be cheeky, & add to that, what criteria would you apply to all fossils to determine whether they are transitional or not? Mark ------------------Occam's razor is not for shaving with.
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