Posted: Wed Apr 20, 2005 2:49 pm
Ok, let's start from 0.
Evolution is the change in allele frequencies over time. Its mechanisms for that change are natural selection, gene flow, genetic drift, mutation, and genetic recombination. Recombination happens during meiosis (do creationists believe in meiosis?) where genetic material is randomly distributed thereby creating a child genetically different and ultimately morphologically different (although they may appear similar) than the parents. Gene flow is the simple exhange of genes between populations such as Asians with Africans. Genetic drift occurs when a small population is isolated and its genome is more fully and quickly expressed, for example the Amish, the people of Pitcairn Island, or to a more severe degree Homo floresensis. Mutation is the simple abnormality that occurs because of a failure of genetic processes such as mitosis or meiosis. An example of mutation would be sickle cell anemia, or Tay-Sachs disease.
Macroevolution--take above adaptations and mechanisms and wait. How do we identify macroevolution? Cladistics, analogous and homolgous traits indecies through systematic quantitative measurements. What traits do animals possess? Ancestral traits are those linked to a common ancestor like four limbs. Not all creatures with four limbs are related some very basic traits are can occur independently but be roughy equivalent such as wings on a butterfly and wings on a hawk. One can see a non-specific or more generalized ancestor develop into a more specialized creature such as the Archaeopetryx which Cyberweez has generously shown to be a transitional fossil not between dinosaur and bird but between reptile and bird.
Both articles sited about horses and whales show the vast variation between current species. That argument is not good because ancestral members of both existed long before others. In other words animals clearly identifiable as equus existed long before modern horses. Take the dog too. Clearly canine animals exist as far back as Pliocene Epoch yet modern dogs show enormous variation yet most breeds didn't exist until human manipulation of evolution occured in just the last few centuries.
Take another primate example,Homo erectus is clearly definable as a separate species by 2 million years ago at that time he possessed a cranial capacity of around 900 cubic centimeters. By 300,000 years ago numerous examples of the same fellow can be shown to have brain cases in the 1200 to 1400 range, very near modern humans yet still maintain differences from modern humans. Go back even farther and you have Homo habilis who is represented just like erectus, by the end of its definable existence it shows the same similarities but still slight differences. They both can be clearly shown to be transitional fossils and numerous examples have been located from around the world, not just a few. This lineage can be continually studied at least as far back as Australopithecus afarensis and "lucy" was far from modern humans yet over 3 million years look what can happen as the earth changes, niches open, niches close, and climates vary. Not all clear lines can be made at this point but the mechanism for the change is obvious to those who study it.
Can anyone show me evidence for creationism? Can anyone show me clear scientific evidence against evolution?
Evolution is the change in allele frequencies over time. Its mechanisms for that change are natural selection, gene flow, genetic drift, mutation, and genetic recombination. Recombination happens during meiosis (do creationists believe in meiosis?) where genetic material is randomly distributed thereby creating a child genetically different and ultimately morphologically different (although they may appear similar) than the parents. Gene flow is the simple exhange of genes between populations such as Asians with Africans. Genetic drift occurs when a small population is isolated and its genome is more fully and quickly expressed, for example the Amish, the people of Pitcairn Island, or to a more severe degree Homo floresensis. Mutation is the simple abnormality that occurs because of a failure of genetic processes such as mitosis or meiosis. An example of mutation would be sickle cell anemia, or Tay-Sachs disease.
Macroevolution--take above adaptations and mechanisms and wait. How do we identify macroevolution? Cladistics, analogous and homolgous traits indecies through systematic quantitative measurements. What traits do animals possess? Ancestral traits are those linked to a common ancestor like four limbs. Not all creatures with four limbs are related some very basic traits are can occur independently but be roughy equivalent such as wings on a butterfly and wings on a hawk. One can see a non-specific or more generalized ancestor develop into a more specialized creature such as the Archaeopetryx which Cyberweez has generously shown to be a transitional fossil not between dinosaur and bird but between reptile and bird.
Both articles sited about horses and whales show the vast variation between current species. That argument is not good because ancestral members of both existed long before others. In other words animals clearly identifiable as equus existed long before modern horses. Take the dog too. Clearly canine animals exist as far back as Pliocene Epoch yet modern dogs show enormous variation yet most breeds didn't exist until human manipulation of evolution occured in just the last few centuries.
Take another primate example,Homo erectus is clearly definable as a separate species by 2 million years ago at that time he possessed a cranial capacity of around 900 cubic centimeters. By 300,000 years ago numerous examples of the same fellow can be shown to have brain cases in the 1200 to 1400 range, very near modern humans yet still maintain differences from modern humans. Go back even farther and you have Homo habilis who is represented just like erectus, by the end of its definable existence it shows the same similarities but still slight differences. They both can be clearly shown to be transitional fossils and numerous examples have been located from around the world, not just a few. This lineage can be continually studied at least as far back as Australopithecus afarensis and "lucy" was far from modern humans yet over 3 million years look what can happen as the earth changes, niches open, niches close, and climates vary. Not all clear lines can be made at this point but the mechanism for the change is obvious to those who study it.
Can anyone show me evidence for creationism? Can anyone show me clear scientific evidence against evolution?