Barbarian
Member
- Jun 5, 2003
- 33,208
- 2,513
Downplaying contradictions like this doesn't make them go away.
As you know, these are not contradictions.
For those who don't know genetics has provided considerable discordance across phylogeny trees for the last 30 years. Pig insulin being closer to human than chimp insulin is is just the tip of the iceberg.
Well, let's take a look at that, and see how it plays...
So differences in conserved molecules happen by random mutations to sites on the molecule that don't affect its function. So let's say that 25 amino acids on the small (51 amino acids) insulin molecule are not conserved and can vary without changing function.
So a random mutation is relatively unlikely to work, but it does happen now and then. So humans had zero to two since the last common ancestor with chimps, and chimps had zero to two also. At the same time, chimps differ by two amino acids from swine and humans have one difference.
This would most likely be the result of one random mutation in humans that substituted an amino acid that also happened to be in swine at that site. Which is perfectly consistent with evolutionary theory. And quite likely as well. This, as I pointed out before, is why creationists like to cite very small molecules, rather than large ones, which would have many more mutations, and with a large number would not show what they would like to regard as "contradictions." Of course, they ignore the much more significant evidence from statistically valid sources.
A theory that only uses evidence tht supports itself and ignores evidence contrary is akin to someone promoting a doctrine based on scriptures that only support their idea and completely ignoring scriptures to the contrary. So creationists ignore the data, and try to find anomalies in smaller molecules, and imagine single mutations are impossible.
The gene for interleukin-26 gene is only found in humans and chickens,
Turns out, it's actually a viral fragment, inserted by a virus similar to herpes, which infects both chickens and humans.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC256879/?page=1
Is it beginning to dawn on you that all these "contradictions" aren't really contradictions at all?
if evolution were true there would be a common ancestor and transitionals.
Or at some point, humans happened to be infected by a virus that infects birds.
I hope you would reconsider Intelligent Design theory,
There is no such thing. As the courts have found, it's a religion, not a theory. Creationism with a shave and clean clothes.
it takes an open approach to the observations and makes more sense.
"Sense" like that, science can't use. The purpose of science is to find the truth, not to obscure it.
Yet, relaxins of a pig and whale are almost identical.
Both being ungulates, that's not a surprise.
Well they are now, but ungulates used to be only hooved animals.
Actually, scientists had long suspected whales of having evolved from ungulates, since they had ungulate digestive systems, and other anatomical features common to other ungulates. But then genetic analysis nailed it.
They either had to reject evolution as a failed theory or make a radical change and combine cows, sheep, hippos, goats, etc, with whales and dolphins.
And now, you know better. Scientists knew there must be a connection long before DNA analysis confirmed it.
So now evolution says a sheep and dolphin are related.
Anatomy first said so. Then genetic data said so. Then, the predicted transitionals were found. So you've been given some false information there.
J. Zool. Syst. Evol. Research 39 (2001) 77±90
Evidence from the digestive tract on phylogenetic relationships
in ungulates and whales
P. L ANGER
Although Honeycutt and Adkins (1993) acknowledged disagreement between results based on morphological and molecular investigations, they emphasized a sister-group relationship between Artiodactyla and Cetacea. According to Broham et al. (1999) the `split' between whales and even-toed ungulates took
place about 60 million years ago, thereafter the cetaceans entered the oceans (Williams 1999). However, during the early to middle Eocene (about 50 million years ago) Ambulocetus natans (i.e. walking whale that swims') could locomote in water as well as on land (Thewissen et al. 1996). The Cetacea show considerable adaptation to aquatic life, such as the replacement of hind-legs
by an eff€ective fluke and the transformation of forelimbs into fippers, but according to Milinkovitch et al. (1998) `cetaceans are highly derived artiodactyls.' `Hippopotamuses are the closest extant relatives of whales' (Nikaido et al. 1999).
There is a better explanation for the genetic information.
None that can adequately explain these facts.
Depending on which gene we look at humans are closer to elephants and distant to armadillos.
Let's test that.
Show us the data from some big molecules, like hemoglobin, DNA, and mitochondrial DNA. Creationists won't do that, because the sample size makes them reliable indicators of relationship. Instead, they cherry pick the few small molecules that don't show relationships. If you want to use small molecules, use a few dozen random conserved molecules and show us that.
If you want to test that all you have to do is...
Test those that represent samples large enough to be significant. You've done the equivalent of hand-picking fifty-one people as a suitable sample of American opinion.
You've been misled about those phylogenies. Note that the phylogenies you did use were from small molecules, which have lower resolution, but they still show the same general trend. Vertebrates have a common ancestor, tetrapods have a common ancestor, amniotes have a common ancestor, and so on.
The cytochrome-C protein in humans and horses differs by 14 amino acids. Compared to kangaroo's it differs by eight. When the same strand is examined, turtles appear closer to man than to a reptile such as the rattlesnake
For such a small molecule, with only a few non-conserved sites, it's remarkably accurate. Grasse is wrong, of course, about humans and horses. It's twelve. And turtles, being primitive reptiles, should be closer to humans than they are to snakes, which are highly evolved reptiles.
Turtles and snakes are both reptiles
But snakes and lizards are the outgroup compared to turtles and mammals. If mammals evolved from therapsids (and the anatomical and fossil data show that they did), then turtles and humans should be more closely related than humans and snakes.
yet turtle's should be closer to humans than they are to snakes?
Yep, and lungfish are closer to humans than they are to bass.
That's contrary to what evolutionists have been teaching bout reptiles and mammals.
Nope. That's just a story creationists like to tell.
And because snakes are highly evolved?
Yep. Radically changed from the ancestral reptile.
Are you suggesting snakes are more evolved than humans
Such a question is meaningless in science. We are both highly evolved in different ways. But we're closer to the ancestral amniote than snakes are.
and that is why some turtle DNA sequences are closer to humans than snakes?
Yep. Snakes have diverged longer from the common ancestor with turtles than humans have diverged from reptiles. And lungfish have diverged longer from teleosts than they have from humans.
Downplaying contradictions like this with Darwin's theory doesn't make them go away.
You've just been given a lot of false information about what evolution is, and what evolutionary theory says.
I hope you would reconsider taking a more critical approach to Darwin's theory.
Modern evolutionary theory does. It's rather changed from Darwin's theory on a good number of points. Darwin's main points remain, but a lot has been changed. It probably seems like cheating to creationists. Theories change and adapt as new evidence demands. You guys are stuck with the modern revision the Adventists promoted.
About 94% based on the human genome data.
"At the level of indivdual protein sequences, humans are about 97-100% identical to the great apes"
http://cmm.ucsd.edu/varki/varkilab/Publications/B84.pdf
So one study says 97-100% and another says no common ancesrty with chimps for 23% of the genome.
Measuring two different things. But of course, there is no scientific study that says "no common ancestry with chimps."
Looking at the study that said 97-100%, that study was from 2002 and they didn't have the entire chimp genome sequenced until 2005, so thats invalid.
In fact, it used the entire genome. DNA hybridization uses the entire genome. I thought you knew.
The one I cited was from the Molecular Biology and Evolution Journal, and they said "For about 23% of our genome, we share no immediate genetic ancestry with our closest living relative, the chimpanzee."
As you seem to now understand, they did not say "no common ancestry with chimps." They said the opposite.
The most anyone can honestly claim is 87%.
No that's wrong. It' merely means that there are huge stretches of non-coding DNA, repeats, and so on that are present. But it still means the actual proteins produced by our genes shows 97-100% identity.
…in two-thirds of the cases a genealogy results in which humans and chimpanzees are not each other’s closest genetic relatives.
We conclude that about 1/3 of our genes started to evolve as human-specific lineages before the differentiation of human, chimps, and gorillas took place. This explains recurrent findings of very old human-specific morphological traits in the fossils record, which predate the recent emergence of the human species about 5-6 MYA. Furthermore, the sorting of such ancestral phenotypic polymorphisms in subsequent speciation events provides a parsimonious explanation why evolutionary derived characteristics are shared among species that are not each other’s closest relatives.
http://genome.cshlp.org/content/19/5/868.abstract
It seems you unwittingly cite research that confirms human ancestry from the apes. It merely suggests that many genes now common to humans were present in the ancestors of all apes, and were subsequently lost in chimps, with many in chimps that were lost in humans, and some of these were retained in other apes. You've undercut your own argument.
By comparison 75% of human genes have some counterpart in nematodes (worms).
That's about what evolutionary theory would predict. Do you have a point?
Evolution did not predict worms and humans would have 75% of anything in common.
It did and does. Humans and nematodes are out on one branch of the bush of life. We are both metazoans, and as such, we have most of our genes in common. Not as many as we share with chordates, vertebrates, tetrapods, aminotes, mammals, and apes (in order of increasing similarity), but still, most of them.
My point was evolution is just looking more and more silly in light of molecular phylonegy.
And now you know better.
Barbarian observes:
The reason no other theory has seriously challenged his theory is that no other theory can effectively explain the evidence.
After comparing 2000 genes common to that are common to humans, frogs, sea squirts, sea urchins, fruit flies and nematodes Syvanen said:
"Roughly 50 per cent of its genes have one evolutionary history and 50 per cent another,"
Well, let's take a look...
And that from a relatively small molecule, cytochrome c. How can both of these be true? If you think about it, I'm sure you'll realize how.
No other theory is necessary to challenge evolution, a theory that is 50/50 fails all by itself.
See above. If your argument depends on cherry-picking a few small molecules, and ignoring the data from much larger and therefore statistically more reliable ones, isn't that a tip-off for you?
Based on this cherry-picking, humans have been paired with chickens, sea squirts paired with frogs. It's a sad thing when creationists have to resort to deception to make their points.
Dolphins paired with sheep,
Which would have to be true, if evolutionary theory is correct. Not surprisingly, the predictions based on anatomy were confirmed by fossil transitionals and genetic data.
You've offered several times to produce a transitional for any two said to be related.
In that comparison of 2000 genes Sea squirts were found to be related to frogs, I'd ask you to produce transitionals for those but I don't think any good would come of asking.
Cephalochordates. Transitional between sea squirts and true chordates like frogs.
It's a long way from amphioxus
It's a long way to us…
It's a long way from amphioxus
To the meanest human cuss.
It's good-bye, fins and gill slits,
Hello, lungs and hair!
It's a long, long way from amphioxus,
But we all came from there!
A fish-like thing appeared among the annelids one day;
It hadn't any parapods or setae to display.
It hadn't any eyes or jaws, or ventral nervous chord,
But it had a lot of gill slits and it had a notochord.
(chorus)
It wasn't much to look at, and it scarce knew how to swim.
And Nereis was very sure it hadn't come from him.
The molluscs wouldn't own it, and the arthropods got sore,
So the poor thing had to burrow in the sand along the shore.
He burrowed in the sand before a crab could nip his tail.
He said "Gill slits and myotomes are all to no avail.
I've grown some metapleural folds, and sport an oral hood.
And all these fine new characters don't do me any good!"
(chorus)
He sulked a while down in the sand without a bit of pep.
Then he stiffened up his notochord and said "I'll beat 'em yet!
Let 'em laugh and show their ignorance; I don't mind their jeers!
Just wait until they see me in a hundred million years!"
"My notochord shall turn into a chain of vertebrae;
As fins, my metapleural folds will agitate the sea.
My tiny dorsal nervous chord shall be a mighty brain
And the vertebrates will dominate the animal domain!"
(chorus)
Fight Song of the University of Ediacara
Well, technically, it now appears that we aren't directly descended from Amphioxus (now known as Brachiostoma), but rather from a slightly different offshoot of the urochordata. Most likely, the Appendiculara.
Last edited by a moderator: