The Barbarian
Crabby Old White Guy
- Apr 3, 2003
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Barbarian observes:
Hmm... about 5 million years of growth, though various species of Homo. There's a very simple and testable mechanism. It's called "allometry." The growth of the human brain is directly attributable to the retardation of maturation in humans. We take a lot longer to mature, and we never fully assume an adult form as other apes do. This is why young chimps look so human; they are immature, and more closely resemble us in facial features, skull-to-face ratio, length of limbs, size of jaws, and so on.
Ok, I know what it says already but...
Hmm... about 5 million years of growth, though various species of Homo. There's a very simple and testable mechanism. It's called "allometry." The growth of the human brain is directly attributable to the retardation of maturation in humans. We take a lot longer to mature, and we never fully assume an adult form as other apes do. This is why young chimps look so human; they are immature, and more closely resemble us in facial features, skull-to-face ratio, length of limbs, size of jaws, and so on.
Barbarian is prone to generalities.
Allometry is the observed fact. Why it happens is the question.
Barbarian observes:
You've been misled on that. We can see a growth in the brain as far back as the early Australopithecines. And likewise, in the gracile Australopithicines and their relatives, a reduction in tooth and jaw size, and a flattening of the face, indicating that feotalization was even then progressing.
That looks like a cut and paste....something....The 118-bp HAR1 region showed the most dramatically accelerated change , with an estimated 18 substitutions in the human lineage since the humanchimpanzee ancestor, compared with the expected 0.27 substitutions on the basis of the slow rate of change in this region in other amniotes . Only two bases (out of 118) are changed between chimpanzee and chicken, indicating that the region was present and functional in our ancestor at least 310 million years (Myr) ago. No orthologue of HAR1 was detected in the frog (Xenopus tropicalis), any of the available fish genomes (zebrafish, Takifugu and Tetraodon), or in any invertebrate lineage, indicating that it originated no more than about 400 Myr ago . (An RNA gene expressed during cortical development evolved rapidly in humans)
Barbarian observes:
You've been misled on that. We can see a growth in the brain as far back as the early Australopithecines. And likewise, in the gracile Australopithicines and their relatives, a reduction in tooth and jaw size, and a flattening of the face, indicating that feotalization was even then progressing.
Here's a hint:
It's not genes. But as far as the question at hand, about
(Nature 437, 69-87 ) What is the genetic basis for the threefold expansion of the human brain in 2 1/2 million years?(Genetics, Vol. 165, 2063-2070) What is the genetic and evolutionary background of phenotypic traits that set humans apart from our closest evolutionary relatives, the chimpanzees?(Genome Research 14:1462-1473)
It's not genes. But as far as the question at hand, about
(Nature 437, 69-87 ) What is the genetic basis for the threefold expansion of the human brain in 2 1/2 million years?(Genetics, Vol. 165, 2063-2070) What is the genetic and evolutionary background of phenotypic traits that set humans apart from our closest evolutionary relatives, the chimpanzees?(Genome Research 14:1462-1473)
Ok, I know what it says already but...
Surprise. The process precedes the genus Homo.
Barbarian on the possibility of bipedal protochimps:
Very unlikely. They have the primitive form of the gluteal muscles, which would strongly indicate that they were never re-arranged to form buttocks as in humans. And that's critical to walking upright.
Unless the butt is a precursor to the brain you are grasping at straws. Barbarian on the possibility of bipedal protochimps:
Very unlikely. They have the primitive form of the gluteal muscles, which would strongly indicate that they were never re-arranged to form buttocks as in humans. And that's critical to walking upright.
Not for bipedalism, it isn't. Buttocks are more than cushioning.
Barbarian suggests:
But since you're very sure you can eliminate any transitionals in humans, are you ready to put that belief to the test? At the same time, I'll try to get the skull size data, so you can test your "sudden brain" hypothesis. Ready to go?
This just drips with absurdityBarbarian suggests:
But since you're very sure you can eliminate any transitionals in humans, are you ready to put that belief to the test? At the same time, I'll try to get the skull size data, so you can test your "sudden brain" hypothesis. Ready to go?
Great. Then maybe you'd like the more advanced quiz.
Which of these are apes, and which of these are humans? Since you're certain that there are no transitionals, it should be a snap. And tell us by what criteria you made your decision for each.
Good luck.
I have been through the Talk Origins case of skulls a dozen times and the other bogus, so called, evidence of transnationals from ape to man. I offer you detailed specifics and you spam these bizarre images. Start with the Human Family Tree at the Smithsonian site and then pick a specific fossil. Otherwise you are just another spammer wasting everyone else's time. __Which of these are apes, and which of these are humans? Since you're certain that there are no transitionals, it should be a snap. And tell us by what criteria you made your decision for each.
Good luck.
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