A test for claimed knowledge of how macroevolution occurs

I really wish you wouldn't make yourself the topic of discussion, but if you insist on making false claims about yourself then others will be forced to correct you. It is the rare message from you that doesn't contain multiple factual errors, and people have corrected you many, many times. You have no excuse for understanding biology and geology as poorly today as when you joined nearly 18 years ago. Everyone has provided a multitude of examples over many years of what you don't understand, often providing the factual basis. You are as delusional about the quality of your views as you are about the degree of your scientific understanding.--Percy

I'm a participant in this thread and so shouldn't be moderating, but it doesn't seem unreasonable to briefly slip into my moderator role to ask that people move discussion of flood issues to the Geology and the Great Flood forum. There are a number of appropriate threads there, or new ones may be proposed.

Is this what you mean by a "homogeneous" population, that they have a "general homogeneous appearance" ... (with some variation presumably in size)?Would "motley traits" mean the various traits (color, legs, horns, etc) that go to make up each individual?Curious. A large herd with "high genetic diversity" would have many variations in phenotypes with "strongly different traits" ... as shown by the analysis with Mendalian inheritance in Message 587. But you ignore selection, mutation and ecological forces, in the formation/development of all phenotypes, and you are positing a "homogeneous" parent population, so you have no mechanism to make traits that don't "necessarily manifest in some obvious way at first, just enough to be selected in breeding, or even in nature, but not enough to show up in a herd unless you go through it individual by individual." Rather they should all be seen in the parent population.And how do you know that the changes in the sub-populations are not due to mutations?Curious again.EnjoyEdited by RAZD, : .

You said, "Continue until the latest daughter populations run out of genetic variability," and that's what I was responding to. What are you imagining is going to cause daughter populations to run out of genetic variability? Here's your experiment boiled down to bullet points and filling in some ambiguities that you can correct if I have it wrong:

1. Start with a population of 100 mice. Measure the genetic diversity.
2. Let the population grow to 400, then divide it into four populations of 100 mice. Each population will have roughly the same genetic diversity as the original population of 100 mice. The four habitats should be identical so that selection pressures are the same. Measure the genetic diversity of each population.
3. Repeat step 2 until the daughter populations "run out of genetic variability" (your words). Keep in mind that you can't repeat step 2 too many times unless you have a very large laboratory and hefty financing. After 1 generation you have 4 100-mouse populations. After 2 generations you have 16 100-mouse populations. After 3 generations you have 64 100-mouse populations. After 4 generations you have 256 100-mouse populations. After 5 generations you have 1024 100-mouse populations. You get the idea.

Please correct the above until I have it right, then answer the question of what is going to cause the daughter populations to "run out of genetic variability."You're probably thinking that at each division into four daughter populations that some alleles wouldn't make it, and you would be correct for rare alleles in the original population. It would not cause the daughter populations to "run out of genetic variability." The term "homogeneous appearance" is ambiguous. It sounds like you mean something like genetically uniform, which would be synonymous with a reduction in genetic diversity, but this is unlikely to occur even after many generations of breeding unless some kind of strong selection pressure is applied, like selecting for specific coat color, head shape, tail length, ear size and shape, etc. In the absence of strong selection pressures by the breeder the mouse population will remain about as genetically diverse as when they started.--Percy

Even though you use the word "breeds," I don't think you're talking about breeding but about races and subspecies.
Yes, the same processes govern the creation of races, subspecies and species, but species implies a reproductive barrier with other species. This is ambiguous. If you're saying that species in the wild can breed with other populations of the same species, this is undoubtedly true. If you're saying that species in the wild can breed with other populations of related species, this can be true, though the offspring can experience abnormalities or infertility depending upon the degree of relatedness. If you're saying that species in the wild can breed with populations of many other species in the wild then this is undoubtedly false.Explaining in a bit more detail, it is not uncommon for species to be able to breed with other closely related species. Because they're closely related, tigers can interbreed with lions, leopards and panthers, zebras with horses and donkeys, camels with llamas, etc. But species cannot breed with other unrelated species, not in the wild and not in the lab. For instance, while tigers can breed with lions, leopards and panthers, they cannot breed with cheetahs, bobcats, housecats, zebras, gazelles, rabbits, gophers, hippopotamuses, rhinoceroses, lemmings, turtles, frogs, birds and fish. I understand what you're trying to say, so let me say it another way: In the wild some species that are genetically able to interbreed simply do not, or at least only rarely. The reason could be physical, behavioral, geographical, or some combination. Or course it's a gene or genes controlling the trait. When the breeder selects mating pairs based upon a certain trait, on a genetic level he's selecting or deselecting (both are possible) alleles of that gene(s) related to that trait. In other word, he's causing allele frequencies that favor that trait. If you mean allele frequencies favored these changes then yes, you are correct. But as Rapid large-scale evolutionary divergence in morphology and performance associated with exploitation of a different dietary resource tells us, "Genetic mitochondrial DNA analyses indicate that the lizards currently on Pod Mraru are indeed P. sicula and are genetically indistinguishable from lizards from the source population." That is, the genetic changes were very minor. Nobody's insisting on razor sharp precision. We just want to know what in the world you mean. Your insistence on words and phrases that are vague and ambiguous is what convinces people that you don't know what you're talking about and, as you just said yourself, that you don't really care. If that's really true then you're probably the only one here who doesn't care whether they're right or wrong or understand the discussion or are making themselves understood.It is apparent that locked away in your imagination is that a population becomes more "homogeneous" over time, that the alleles become distributed more and more evenly in the population, and that the individuals become more and more similar. There is absolutely no evidence of this in population genetics. The "appearance of homogeneity" is just something else from your imagination. You're analogous to the cop on the beat who says about blacks that they all look alike to him. You look at a population of pigeons and think how alike they all are, but they're really not alike at all. Look at how different all these pigeons are: We have a bird feeder, and even just glancing at them casually you can see the many differences between individual nuthatches, goldfinches, woodpeckers, wood doves and so forth. But who could know what you mean by this because you've made up your own definition of species where a new species is actually still the same species, they just choose not to interbreed. But the real world definition of species is a population that can interbreed. If two populations are still capable of interbreeding (without abnormalities or infertility) then they are, by definition, the same species. As populations become more and more distant genetically then interbreeding gradually becomes less and less likely to produce viable offspring.At what point does one declare two populations to be different species? When viable offspring are produced less than 80% of the time? 50% of the time? 10% of the time? This isn't a question that science has attempted to answer yet, at least not that I'm aware of. Of course, it would be a judgement call anyway. Again, we don't need razor sharp precision, but we do need to know how you're defining your terms. You should stop using the term "homogeneous" because there is no agreement on what you mean by it. I think what you're trying to say is that when a subpopulation first splits off from the main population that it has the same level of genetic diversity as the parent population. This is true as a first approximation, but in general a subpopulation can't help but have at least slightly less genetic diversity than the parent population. Or if a population splits roughly in half then each half will likely have slightly less genetic diversity then the original population. You have a mistaken idea of the amount of variation in a parent population. Look at how different all these wildebeest are with regard to size, build, coat, stripes, horns, facial coloration, eyes, nose, etc.: I once drove through a bison herd in South Dakota. The difference in appearance between all the bison was striking, not to mention the difference in temperament. Some would challenge the van, blocking the road and facing us down. Others quickly scampered off to the side as we got closer. Some got out of the way but took their own sweet time. But you just said the "founding population...looks like the parent population." If it has a new set of allele frequencies, how could it also look just like the parent population? Can you clear this up? Unless selection pressures are different they'll very closely resemble the parent population. Again, unless selection pressures are different they'll very closely resemble the parent population, and especially if there's still gene flow with the parent population. Again, that individuals of a population become more and more similar across the generations is just something from your imagination. There's no evidence for it. Without strong selection pressures genetic diversity would be maintained. Given the huge number of biology experiments that have been conducted and all the research into population genetics, what you describe could not have escaped notice if it were what really happens. It isn't necessary to run your experiment to know that you are wrong. Nothing you said aligns with what we already know to be true about the genetic diversity of populations.--Percy

The idea of the Flood laying down geological strata was debunked long ago. To take just one example, fossils are sorted by time period: earlier organisms at lower levels. A flood would have jumbled everything up, humans with trilobites and dinosaurs with dogs, etc.The idea of the Grand Canyon being carved by a massive flood was debunked long ago: it is, for instance a deep, meandering riverbed, not a wide, shallow, direct path.As for the corals, how could they have survived being buried under all that sediment? Since they didn't survive, we wouldn't see any reefs nowadays. Even if Noah had brought along some coral larvae and released them after the flood, how could they have grown to the depth and worldwide extent that we see today?

Right, well they weren't all jumbled up in the Flood, somehow they got sorted by the Flood. Ocean water is layered by the way, and layers are easily formed by water. And if they were going to be jumbled up it should have been in the jumbled up mixtures of dirt that normally occur on the earth instead of in those supposed burial grounds of oh-so neat horizontal sediments of the time periods over those supposed millions of years. If animals just lye down and die, it isn't in such perfect graveyards. And so many of them, one for each "time period" that came along to bury them. Besides which, fossilization is a rare occurrence but the Flood would have suppled ideal conditions for the fossilization of bazillions of animals. WHICH, by the way, are evidence of the purpose of all that death in the Flood as described in the Bible.A massive amount of rushing water cascading down through widening cracks and over the sides would certainly do a fine job of carving the canyon. And again what's ridiculous there is the idea that an ordinary river carved out that enormous space.Lots of fragile things were preserved in the sediments which precipitated down over them. Edited by Faith, : No reason given.Edited by Faith, : No reason given.Edited by Faith, : No reason given.Edited by Faith, : No reason given.Edited by Faith, : No reason given.

Can’t you believe in majik from the old girl’s heart
How the majik can tell you anything that you want
Cuz it’s majik and the strata is bolder
Got all laid down at once with the fossils in orderYou know the fluddy is majik that’ll save your soul
We all singin' and dancin' to god’s own rock and roll
Yes, it’s majik (yah ya know it's majik)
Gotta believe in majik (yah ya know it's majik)

You say, "somehow they got sorted by the Flood." But that's not what happens in a flood, is it? On the other hand, accretion over millennia does lay down layers "sorted" in historical order. That's not even mentioning the lava flows that appear in between sedimentary layers. Hard for a flood to lay down lava.And no, rushing flood waters would not have worn out a riverbed like that. "Upstream of the Grand Canyon, the San Juan River (around Gooseneck State Park, southeast Utah) has some of the most extreme meandering imaginable. The canyon is 1,000 feet high, with the river flowing five miles while progressing one mile as the crow flies (American Southwest n.d.). There is no way a single massive flood could carve this." - CH581: Carving the Grand Canyon

I'm a black magic woman, but I don't believe in magic.

That's amusing. Creationists have been doing that for thousands of years and getting nowhere. Science has been at it for a couple of hundred and has a consensus.It's game over for YECs and has been for centuries. Your all individuals hiding in caves shouting.

What on earth do you mean by rushing waters "wearing out" a river? None of the rivers that are now in the area of the Grand Canyon were there at the point when the Flood started draining.ABE: Sorry, I misread you, answered what you actually said in Message 704 /abe"That's not what happens in a flood" is the usual utterly ridiculous attempt to turn this worldwide catastrophe into any ordinary flood. The only part of it that was like a usual flood would have been in the beginning and then it would have been like a million floods all over the planet causing mudslides and waterfalls. In THE Flood besides all that happening, the oceans rose up over the land and yes water does create layers.And your assertion that time periods would do that is just some kind of wishful inability to think about it. That is about the most absurd thing claimed about the scenario of the fossil record, yet normally intelligent people just won't let themselves think about it.There are very few places where lava intrudes into the layers and it's very clear that most of it happened after the sedimentary layers were already laid down.So you're getting your stuff from Talk Origins. I can go there myself you know. How about being original? Obviously you haven't given a moment's thought to anything I actually said, about how rivers would have formed AFTER the Flood had drained, and meanders as well, on the flat surfaces such as the Kaibab plateau, that had been scoured off by the retreating Flood. This scenario works very well and it's all my own, I don't go to creationist sites to get my stuff..Look, we're on the wrong thread for discussing the Flood and I'm not going to continue this with you. I've discussed it at great length on many threads here and your stuff is just the usual collection of crap that gets thrown at creationists all the time. Since you haven't followed my previous presentations of my argument you don't have a clue about any of it and I'm not up to it right now.Edited by Faith, : No reason given.Edited by Faith, : No reason given.Edited by Faith, : No reason given.

That's not exactly what was written. Why do you write so many untruths?Edited by Pressie, : No reason given.

Oh I misread it, thanks. WORN OUT A RIVERBED.OK, the answer to that is the river wore out the riverbed over the last 4300 years. And it's absurd to think I was saying the rushing water had anything at all to do with the current riverbed.

The biological test for species is whether or not they interbreed with other populations. That's because of the definition of species used in biology.

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Defining speciation

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Speciation is a lineage-splitting event that produces two or more separate species. Imagine that you are looking at a tip of the tree of life that constitutes a species of fruit fly. Move down the phylogeny to where your fruit fly twig is connected to the rest of the tree. That branching point, and every other branching point on the tree, is a speciation event. At that point genetic changes resulted in two separate fruit fly lineages, where previously there had just been one lineage. But why and how did it happen?

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The branching points on this partial Drosophila phylogeny represent long past speciation events.

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Look familiar?There are some difficulties, however:

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Defining a species

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A species is often defined as a group of individuals that actually or potentially interbreed in nature. In this sense, a species is the biggest gene pool possible under natural conditions.

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For example, these happy face spiders look different, but since they can interbreed, they are considered the same species: Theridion grallator.

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That definition of a species might seem cut and dried, but it is not ” in nature, there are lots of places where it is difficult to apply this definition. For example, many bacteria reproduce mainly asexually. The bacterium shown at right is reproducing asexually, by binary fission. The definition of a species as a group of interbreeding individuals cannot be easily applied to organisms that reproduce only or mainly asexually.

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Also, many plants, and some animals, form hybrids in nature. Hooded crows and carrion crows look different, and largely mate within their own groups ” but in some areas, they hybridize. Should they be considered the same species or separate species?

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If two lineages of oak look quite different, but occasionally form hybrids with each other, should we count them as different species? There are lots of other places where the boundary of a species is blurred. It's not so surprising that these blurry places exist ” after all, the idea of a species is something that we humans invented for our own convenience!

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Classification is for our use in discussions, and they are subject to change when information provides new insights.

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Carrion Crow: Distribution and genetic relationship to hooded crows

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The carrion crow (Corvus corone) and hooded crow (Corvus cornix, including its slightly larger allied form or race C. c. orientalis) are two very closely related species[7] whose geographic distributions across Europe are illustrated in the accompanying diagram. It is believed that this distribution might have resulted from the glaciation cycles during the Pleistocene, which caused the parent population to split into isolates which subsequently re-expanded their ranges when the climate warmed causing secondary contact.[8][9]

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A map of Europe indicating the distribution of the carrion and hooded crows on either side of a contact zone (white line) separating the two species

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Poelstra and coworkers sequenced almost the entire genomes of both species in populations at varying distances from the contact zone to find that the two species were genetically identical, both in their DNA and in its expression (in the form of mRNA), except for the lack of expression of a small portion (<0.28%) of the genome (situated on avian chromosome 18) in the hooded crow, which imparts the lighter plumage colouration on its torso.[8] Thus the two species can viably hybridize, and occasionally do so at the contact zone, but the all-black carrion crows on the one side of the contact zone mate almost exclusively with other all-black carrion crows, while the same occurs among the hooded crows on the other side of the contact zone.

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It is therefore clear that it is only the outward appearance of the two species that inhibits hybridization.[8][9] The authors attribute this to assortative mating (rather than to ecological selection), the advantage of which is not clear, and it would lead to the rapid appearance of streams of new lineages, and possibly even species, through mutual attraction between mutants. Unnikrishnan and Akhila propose, instead, that koinophilia is a more parsimonious explanation for the resistance to hybridization across the contact zone, despite the absence of physiological, anatomical or genetic barriers to such hybridization.[8]

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Also see Two species of crow evolving ... on this possible crow speciation in process, apparently due to coloration:

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"Only two major effect genes which together encode the feather colour differ sharply on either side of the hybrid zone - the gray alleles are not found to the west of the zone and the black allele is absent in the eastern region," Wolf said.

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Breeding populations apparently separated by sexual/mate selection.

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Koinophilia is an evolutionary hypothesis proposing that during sexual selection, animals preferentially seek mates with a minimum of unusual or mutant features, including functionality, appearance and behavior.[1][2][3][4][5][6] Koinophilia intends to explain the clustering of sexual organisms into species and other issues described by Darwin's Dilemma.[3][4][5] The term derives from the Greek, koinos, "common", "that which is shared", and philia, "fondness".

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Natural selection causes beneficial inherited features to become more common at the expense of their disadvantageous counterparts. The koinophilia hypothesis proposes that a sexually-reproducing animal would therefore be expected to avoid individuals with rare or unusual features, and to prefer to mate with individuals displaying a predominance of common or average features. ...

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This Koinophilia is similar to what I proposed for sexual selection in Sexual Selection, Stasis, Runaway Selection, Dimorphism, & Human Evolution and my discussion on the causes of stasis in breeding populations living in stable ecological habitats.This Crow mate selection is similar to the overlap of the end of ring species like the Greenish Warbler, another place where the definition of species is problematic.For the record, the crows are listed in List of Corvus species as different species, likely because they were classified before genetic information was available, based on appearance and behavior.Note that you should be delighted that the hooded crow seems to be a product of isolation and gene loss promoting a phenotype that was not apparent in the parent population. The loss is a mutation, of course.Enjoy