Barbarian asks:
We'll get there. First, take a look at my questions on the two above. Can you answer them?
What exactly are you after here?
I'd like someone to answer the questions.
Would you like me to take a guess?
If you don't know enough to say one way or the other, that's a satisfactory answer.
Barbarian observes:
Occasionally, humans are born with complete tails, too. The genes for tails in humans and toes in horses are still there. Mutations suppressed them, but they can still be expressed, showing ancestral forms.
Hmmm. Human tails? This is getting a little silly.
Nevertheless, they happen from time to time.
Which way did the horses evolve, three toes to one, or one to three? How did we end up with both at the same time?
Depends on where you want to start. Some condylarths had five. There is a trend toward reduction in number, but remember, there are several different lines of horses, and some reduced more than others.
Barbarian on breeding large organisms artificially:
So do dogs, and strawberries,and a lot of other things humans breed. We can apply selection to do strange things. However, all modern species of horse are close to the same size.
Which would you rather be trampled by, a Clydesdale or a field horse? It shouldn't matter, since they are so close, right?
Neither of those is a species. They are just varieties of Equus artificially modified by human selection. All species of modern horses are about the same size.
Barbarian on misconceptions:
Unfortunately, you were fed a lot of falsehoods. Why not answer the questions, and we'll go on so you can see for yourself?
(Eldredge on the fact that it is misleading to represent horse evolution as a ladder when it is in fact a bush)
In case you didn't notice, my whole last post was a quote from the link that was supplied. Some of the sources are at the bottom of that page from the same link. An answer to McFadden on a similar question about the bush.
Hmm... this?
"The sequence from the Eocene “dawn horse†eohippus to modern-day Equus has been depicted in innumerable textbooks and natural history museum exhibits. In Marsh’s time, horse phylogeny was thought to be linear (orthogenetic), implying a teleological destiny for descendant species to progressively improve, culminating in modern-day Equus. Since the early 20th century, however, paleontologists have understood [sic] that the pattern of horse evolution is a more complex tree with numerous “side branches,†some leading to extinct species and others leading to species closely related to Equus. This branched family tree (see the figure) is no longer explained in terms of predestined improvements, but rather in terms of random genomic variations, natural selection, and long-term phenotypic changes.â€Â
It merely points out what I've been telling you. The linear model has been dead for a hundred years. Eldredge was talking about this, but your guys doctored the quote so you wouldn't know.
Here is one of the classic proofs of evolution, explicated by Mr. Horse Evolution himself, and are you convinced?
That it's a bush instead of a ladder? Yes. That was known well before I was born.
Consider some salient points. (1) Extinction is not evolution.
The sky is blue, too. Do you think someone doubts it?
If a creature abruptly appears in the fossil record, survives for a time, then goes extinct, no evolution has occurred, in the macro sense.
On the other hand, if there are innumerable intermediates, then one has to conclude that it has.
(2) If animals appeared and existed as contemporaries, they cannot be arranged into ancestral relationships.
The ones I'll be showing you appeared in sequence.
(3) If they existed on different continents, it becomes a stretch to assume they shared genetic information.
The ones I'll be showing you are all North American.
(4) Assigning skeletons to different species is a highly subjective process – and therefore subject to one’s presuppositions.
You've been misled. There has to be an objective measure for keying out taxa. An easy example is reptiles/mammals. One key is the number of bones in the lower jaw, and the location of the jaw joint.
(5) The dating of these fossils assumes evolution and long ages – a case of circular reasoning.
You've been misled about that, too. The ages in geology were worked out by creationists, who thought they were much more recent than they actually are.
(5) Variations in teeth adapted for different feeding habits reveal nothing about the origins of teeth. Teeth are very complex structures (see 03/13/2003 and 06/04/2002 entries).
Teeth in mammals are very variable, and useful for identifying species. The complexity of horse teeth is a measure of their change from browsing to grazing animals. Not surprisingly, we don't see high-crowned hypsilodont (continuously growing) teeth on those that remained browsers.
(6) Terms like “explosive adaptive diversification†assume evolution;
More precisely, they are evidence for evolution.
they explain nothing about how random mutations could have produced simultaneous morphological changes that all had adaptive value.
They weren't all simultaneous. Some evolved apart from others.
(7) Interestingly, McFadden omits any mention of horse toes. The old picture showed three-toed horses evolving into one-hooved horses of today. But even that begs the question of whether one toe is better (or more evolved) than three;
"Better" means nothing in biology. An adaptation is more or less fit for the environment. In a forest environment, three toes and a rotatable ankle is more fit. On the hard ground of open plains, one toe and a springy, restricted ankle is more fit.
Duane Gish in Evolution: The Fossils Still Stay No points out that in the evolutionary story of ungulates, the picture is reversed: ungulates supposedly evolved three toes from one.
Some did. Others remained browsers in woodlands, and never changed. Gish, BTW, is the guy who once claimed a human enzyme was closer to that of a bullfrog than it was to that of a chimp:
""If we look at certain proteins, yes, man then -- it can be assumed that man is more closely related to a chimpanzee than other things. But on the other hand, if you look at certain other proteins, you'll find that man is more closely related to a bullforg than he is to a chimapanzee. If you focus your attention on other proteins, you'll find that man is more closely related to a chicken than he is to a chimpanzee."
From the article:
"John W. Patterson and I attended the 1983 National Creation Conference in Roseville, Minnesota. We had several conversations there with Kevin Wirth, research director of Students for Origins Research (SOR). At some point, we told him the protein story and suggested that Gish might have lied on national television. Wirth was confident that Gish could document his claims. He told us that, if we put our charges in the form of a letter, he would do his best to get it published in Origins Research, the SOR tabloid.
Gish also attended the conference, and I asked him about the proteins in the presence of several creationists. Gish tried mightily to evade and to obfuscate, but I was firm. Doolittle provided sequence data for human and chimpanzee proteins; Gish could do the same - if his alleged chicken and bullfrog proteins really exist. Gish insisted that they exist and promised to send me the sequences. Skeptically, I asked him pointblank: "Will that be before hell freezes over?" He assured me that it would. After two-and- one-half years, I still have neither sequence data nor a report of frost in Hades.
Shortly after the conference, Patterson and I submitted a joint letter to Origins Research, briefly recounting the protein story and concluding, "We think Gish lied on national television." We sent Gish a copy of the letter in the same mail. During the next few months, Wirth (and probably others at SOR) practically begged Gish to submit a reply for publication. According to Wirth, someone at ICR, perhaps Gish himself, responded by pressuring SOR not to publish our letter. Unlike Gish, however, Kevin Wirth was as good as his word. The letter appeared in the spring 1984 issue of Origins Research -- with no reply from Gish...
I next saw Gish on February, 18, 1985, when he debated philosopher of science Philip Kitcher at the University of Minnesota. Several days earlier, I had heralded Gish's coming (and his mythical proteins) in a guest editorial in the student newspaper, The Minnesota Daily. Kitcher alluded to the proteins early in the debate, and, in his final remarks, he demanded that Gish either produce references or admit that they do not exist. Gish, of course, did neither. His closing remarks were punctuated with sporadic cries of "Bullfrog!" from the audience."
http://www.holysmoke.org/gishlies.htm
You should be extremely cautious about any claims Gish makes.
(8) The basal clade Hyracotherium has doubtful relationship to horses at all.
We're testing that now. You seem unable to distinguish the first one from the second genus in this particular lineage.
Furthermore, there is a big gap between Hyracotherium and anything preceding it, so where did it evolve from?
Condylarths. The most immediately horselike was Phenacodus.
"The skeleton of phenacodontids is generally primitive, especially in the long, heavy tail, but some similarities to perissodactyls are evident in Phenacodus: Its limbs are longer than in primitive condylarths and have five hoofed digits, the first and fifth digit being reduced in size. This foreshadows the early Eocene horse Hyracotherium (sometimes called "Eohippus"), which has completely lost the first digit of the hand and the first and fifth digit of the foot. The limb design indicates that Phenacodus was adapted to running to some degree. Only few limb remains are known for Ectocion, but they suggest that these smaller animals may even have been somewhat better runners than its larger relatives. The skull of phenacodontids is long and has a small braincase. In Phenacodus intermedius the nasal bones are retracted, like in recent tapirs, which may indicate that this species of Phenacodus had a short trunk. As the dentition shows, at least the later phenacodontids were herbivores: Their cheek teeth have low cusps that sometimes tend to become joined into crests, similar to early perissodactyls like Hyracotherium."
http://www.paleocene-mammals.de/condylarths.htm
(9) McFadden’s analysis only considers size, teeth, and location. How did the remarkable capabilities of the horse, like catapulting legs (01/02/2003) and damping muscles (12/20/2001)arise by chance?
They didn't. They evolved by natural selection. If you like, we can discuss those features and how they gradually appear. Would you like that?
Barbarian asks:
But I would very much like to see where Hyracotherium and Equus fossils were found right next to each other. Tell us about it.
http://www.answersingenesis.org/creation/v5/i3/horse.asp I'm not sure of the scientific names given, but I think this is what you were after.
Ah, they lied to you. The three-toed horse was Hipparion, a very late browser, one that lived into the time one-toed horses like Pliohippus evolved. That's the reason they didn't give you the species. National Geographic makes it clear in their article, but AIG doctored it a bit, knowing most of their readers wouldn't know the difference.
Be careful what you believe. Not everyone who tells you he is a Christian will be honest with you.