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Author Topic:   MACROevolution vs MICROevolution - what is it?
Taq
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Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


(2)
Message 209 of 908 (816694)
08-09-2017 2:39 PM
Reply to: Message 207 by Faith
08-09-2017 1:50 PM


Re: the usual silly wrong linear analogy
Faith writes:
'cept it isn't cuz evolution, meaning the development of new varieties. requires the loss of the genetic material for other varieties.
That is preceded by the creation of new varieties by mutation.
Faith writes:
If you have a series of population cuts that produce new varieties or races you will soon reach a point in that line of evolution where you've run out of genetic material for further evolution.
You never run out of genetic variation because there are mutations in every individual in every generation.

This message is a reply to:
 Message 207 by Faith, posted 08-09-2017 1:50 PM Faith has replied

Replies to this message:
 Message 210 by Faith, posted 08-09-2017 2:46 PM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


Message 211 of 908 (816696)
08-09-2017 2:54 PM
Reply to: Message 210 by Faith
08-09-2017 2:46 PM


Re: the usual silly wrong linear analogy
Faith writes:
Mutations only help if they occur before selection. Afterward they defeat the purpose of the selection, which is the evolution of a new variety.
There is no purpose in selection. It is not a teleological process.
Take the famous peppered moth example. The source of the black moth may be a mutation, but the whole population of black moths is the result of selecting out all the white moths. There may still be the genetic material for the white moths in some individuals of the population of black moths so that you can still get a new population of white moths under new selection pressure.
There could also be mutations that occur in black peppered moths that result in white moths.
But the principle is that to get a population of the new variety requires losing the genetic stuff for the other variety.
The principle is also that new varieties occur as new mutations occur.

This message is a reply to:
 Message 210 by Faith, posted 08-09-2017 2:46 PM Faith has replied

Replies to this message:
 Message 212 by Faith, posted 08-09-2017 3:08 PM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


(1)
Message 214 of 908 (816701)
08-09-2017 3:41 PM
Reply to: Message 212 by Faith
08-09-2017 3:08 PM


Re: the usual silly wrong linear analogy
Faith writes:
Yeah yeah yeah of course selection isn't purposive but the point is that it's considered to be the way new varieties emerge that have survival value over the parent population, so in a way it looks teleological.
If it isn't teleological, then new mutations don't "defeat the purpose of selection". Selection is simply what happens. You might as well say that water evaporating in the oceans defeats the purpose of rivers flowing water to the oceans.
Sure you can get a new variety from a mutation if it's selected, so what? For it to form a population of this new variety nevertheless requires the loss of all the other varieties.
There are still black and white peppered moths.
Always the end result of the selection processes is loss.
The end result of mutation is gains.
You keep adding stuff without seeing that all it does is produce new varieties or kill old varieties which is a dead end for the ToE.
You can still have the old varieties survive in other populations, and then have those two populations diverge from one another over time. This is called speciation.

This message is a reply to:
 Message 212 by Faith, posted 08-09-2017 3:08 PM Faith has replied

Replies to this message:
 Message 217 by Faith, posted 08-09-2017 10:51 PM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


(2)
Message 218 of 908 (816740)
08-10-2017 10:50 AM
Reply to: Message 217 by Faith
08-09-2017 10:51 PM


Re: the usual silly wrong linear analogy
Faith writes:
It's in the formation of a breed that the processes of evolution are seen, how the formation of new phenotypes REQUJRES the loss of other genotypes.
The formation of new phenotypes only requires mutations. Selection for an already existing phenotype is not the formation of new phenotypes.
I'm always talking about the evolving LINE, not the entire population. It's where new phenotypes are forming that the loss of genetic diversity has to occur.
Over time, new mutations will occur and accumulate in those breeds which increases genetic diversity.
There may be plenty of genetic diversity left in other populations, even other evolving lines and there may be hybrids forming as well, but the trend is always to reduction where you are getting new phenotypes in an isolated population.
As long as the population increases or stays the same you will always get an increase in genetic diversity due to the accumulation of new mutations. That is why species who have not gone through a recent bottleneck have more genetic diversity than species who have gone through a recent genetic bottleneck.
We could talk complicating factors but not until this basic principle is acknowledged.
You need to acknowledge the basic principle that every individual in every generation is born with mutations which increase genetic diversity.

This message is a reply to:
 Message 217 by Faith, posted 08-09-2017 10:51 PM Faith has replied

Replies to this message:
 Message 220 by Faith, posted 08-10-2017 11:20 AM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


Message 219 of 908 (816741)
08-10-2017 10:54 AM
Reply to: Message 216 by Faith
08-09-2017 10:36 PM


Re: the usual silly wrong linear analogy
Faith writes:
It's in the separated lines of variation that the loss has to occur that I'm talking about, a subpopulation that is actively evolving.
Genetic diversity increases due to the accumulation of mutations. If you are selecting for just one allele at one gene locus there are still tens of thousands of other genes that are mutating.
So? Did I say anything different?
Yes, you did. You claimed that one allele must replace the other allele. That is your whole spiel.
stage 1: all white moths
stage 2: 1 black moth and the rest are white moths
stage 3: 50% black moths and 50% white moths
Is stage 3 an increase in genetic diversity over stage 1? Yes or no?

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 Message 216 by Faith, posted 08-09-2017 10:36 PM Faith has not replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


(1)
Message 222 of 908 (816746)
08-10-2017 11:55 AM
Reply to: Message 220 by Faith
08-10-2017 11:20 AM


Re: the usual silly wrong linear analogy
Faith writes:
I don't have time to respond to all of this right now, but I haven't made myself clear about this: I'm not talking about just getting A new phenotype within a population, I'm talking about getting a whole new population characterized by new phenotypes, which is clearly illustrated by domestic breeding.
It is also illustrated by the pocket mice and peppered moths we have discussed previously. In both cases you start with just one color. Over time, you get a mixed population of two colors. How is that not an increase in genetic diversity?
The new phenotypes are brought about by changed gene frequencies due to the formation of an isolated daughter population which may be caused by natural selection or just random migration, or intentional selection in the case of domestic breeding.
False. Those new phenotypes are brought about by mutations in the parent population. New phenotypes will continue to appear in the daughter populations since mutations never stop. If one allele for one gene is selected for this does not stop the process of mutation. It continues in every generation. It is the accumulation of these mutations over time that results in macroevolution.
And what I'm saying is that genetic loss, being necessary to evolving this new species or breed, characterizes evolution itself, and this is not recognized.
You won't recognize the increase in genetic diversity produced by new mutations. We already recognize that mutations in the human lineage have replaced alleles that existed in the common ancestor of humans and chimps. You won't recognize that this is an ongoing process and that it never stops due to the fact that mutations continue to appear and continue to be selected for. This is how we get two co-existing species with different genomes, otherwise known as macroevolution.
This ignores the fact that you have to lose traits and their genotypes in order to get a population with its own characteristic new traits. HAVE TO.
You HAVE TO have mutations to select for, and those mutations increase genetic diversity. You HAVE TO have an accumulation of those mutations over time because there is no mechanism that will prevent it.

This message is a reply to:
 Message 220 by Faith, posted 08-10-2017 11:20 AM Faith has replied

Replies to this message:
 Message 225 by Faith, posted 08-11-2017 9:14 AM Taq has replied
 Message 226 by Faith, posted 08-11-2017 10:32 AM Taq has not replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


Message 227 of 908 (816784)
08-11-2017 10:49 AM
Reply to: Message 225 by Faith
08-11-2017 9:14 AM


Re: the usual silly wrong linear analogy
Faith writes:
I'm not denying increases in genetic diversity through mutation, that's not the point. When you are getting the whole population of black moths you are losing the genetic stuff for the peppered moths, and vice versa.
You also gained genetic stuff to get the new color. That's the point.
Also, the difference in color comes from one gene. There are tens of thousands of other genes in the moth genome. You can't say that overall genetic diversity was lost because of one gene out of tens of thousands.
A mutation changes a single allele in a single gene. Getting a whole lot of single-allele phenotypes in a population isn't evolution and in most cases you aren't even going to get that much as the mutations most often don't change the phenotype. And even if a mutation/phenotype spreads through a population, by drift or positive selection, that is just another case of microevolution, and what's happening while it spreads? It's displacing the alleles for another trait, that other trait and its allele being the genetic loss I'm talking about.
What you are talking about is macroevolution. This is where alleles in the parent population are replaced by new mutations, resulting in a modified daughter population. This is why the human and chimp genomes are different from each other, and will continue to diverge over time due to the continual accumulation of new genetic diversity.
If the new trait is strongly selected it may come to replace the former trait altogether and you'll have the whole new population with the new trait I'm talking about --- because of the LOSS I'm talking about of the other trait and its genetic substrate.
And new mutations will continue to occur and increase genetic diversity. You keep ignoring that fact. You are trying to claim that once selection occurs for a single allele that everything just stops. It doesn't. Mutations continue to appear, and selection will continue to operate as genetic diversity increases.
As I say above, increase in genetic diversity doesn't change the pattern I'm talking about, microevolution which leads to a new variety or species.
You have continually stated that genetic diversity can only decrease. New mutations do change the pattern you are describing.
You may get a new race of chimps but they will be chimps nevertheless.
Precisely, just as our common ancestor with chimps was a primate, and we are still primates. Our common ancestor with bears was a mammal, and we are still mammals. Our common ancestor with fish was a vertebrate, and we are still vertebrates.
I think you are finally understanding what macroevolution is.
The best you'll ever get from mutations is variations on the chimp genome, you'll never get anything but a chimp and while you are getting a new purple chimp or a chimp with too many toes, you have to lose the genetic material for the old chimp so you'll eventually run out of the genetic material needed for further evolution.
You have already agreed that mutations provide new genetic diversity, so there is no running out of genetic material.
What marvelous faith you show! You actually believe that changes in DNA sequence would get you from a chimp to a human being?
First, I have evidence that humans and chimps evolved from a common ancestor, so no faith is needed.
Second, I am not saying that humans evolved from chimps. I am saying that both species evolved from a common primate ancestor, and we are both still primates. The differences between our genomes are due to the very mechanisms that you have already agreed to, mutations followed by selection.
Even if so it's the selection that runs you out of genetic diversity, and it's the selection that brings out the new phenotypes that form the new variety or species, and in order to do that it eliminates the genetic substrate for all the other traits.
New mutations replenish genetic diversity.

This message is a reply to:
 Message 225 by Faith, posted 08-11-2017 9:14 AM Faith has replied

Replies to this message:
 Message 229 by Faith, posted 08-11-2017 1:08 PM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


Message 230 of 908 (816806)
08-11-2017 1:10 PM
Reply to: Message 229 by Faith
08-11-2017 1:08 PM


Re: the usual silly wrong linear analogy
Faith writes:
If you aren't getting the formation of a new variety or species then you can have all the genetic diversity you want. But if you are getting a new variety or species then you are losing genetic diversity. Take your pick.
You are gaining genetic diversity because of mutations. I don't have to pick between your false choices.

This message is a reply to:
 Message 229 by Faith, posted 08-11-2017 1:08 PM Faith has replied

Replies to this message:
 Message 233 by Faith, posted 08-11-2017 2:44 PM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


(1)
Message 235 of 908 (816815)
08-11-2017 3:13 PM
Reply to: Message 232 by Faith
08-11-2017 2:38 PM


Re: the usual silly wrong linear analogy
Faith writes:
But it doesn't increase in reality. If it did you'd get only the see-saw effect I described, which is not evolution because evolution produces identifiable varieties, and macroevolution supposedly takes off from an established variety or species. You get your species that can no longer interbreed with its precursors and supposedly that is the platform for macroevolution. A big fat joke since such a species must be too genetically reduced for much further change if any, let alone change on the order of what would be needed in the direction of a new species. Really, the ToE is just fantasy upon fantasy.
That's like saying you can't walk by moving your legs back and forth.
New mutations produce new phenotypes. New phenotypes are selected for. New mutations produce new phenotypes. New phenotypes are selected for. New mutations produce new phenotypes. New phenotypes are selected for.
IT NEVER STOPS. IT KEEPS GOING.

This message is a reply to:
 Message 232 by Faith, posted 08-11-2017 2:38 PM Faith has replied

Replies to this message:
 Message 238 by Faith, posted 08-11-2017 7:17 PM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


Message 271 of 908 (816960)
08-14-2017 10:42 AM
Reply to: Message 233 by Faith
08-11-2017 2:44 PM


Re: the usual silly wrong linear analogy
Taq writes:
You are getting genetic diversity without evolution. This thread is about evolution. The silly linear model of microevolution to macroevolution is wrong because microevolution reduces genetic diversity, without which evolution has to come to a halt.
Mutations are a part of macroevolution and they add genetic diversity.
If you keep throwing in mutations you bring it to a halt in another way, because it takes selection to produce a new species.
Adding genetic diversity through mutations does not halt evolution.

This message is a reply to:
 Message 233 by Faith, posted 08-11-2017 2:44 PM Faith has replied

Replies to this message:
 Message 272 by Faith, posted 08-14-2017 10:46 AM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


Message 273 of 908 (816964)
08-14-2017 10:46 AM
Reply to: Message 238 by Faith
08-11-2017 7:17 PM


Re: the usual silly wrong linear analogy
Faith writes:
The point is that when the new phenotypes are selected for and form a new population, over time they replace the unselected phenotypes throughout the population and that makes for a loss of genetic diversity in this new population.
Mutations add genetic diversity, and they occur in every individual in every generation. It never stops.
Another way to talk about genetic diversity is in terms of heterozygosity. You get increasing homozygosity for the selected traits in a new population that becomes a new variety or species. This is a general trend. At the extreme, as in old fashioned domestic breeding to get a pure breed, your purebred animal will have a great number of fixed loci for the salient traits of the breed.
You get increasing heterozygosity as that initial mutation is selected for. You also get increasing heterozygosity in other genes as they accumulate mutations.
What happens with a Founder population, one that develops from very very few individuals, is an extreme of what I'm talking about. That's how the cheetah formed, and the elephant seals. It's really just a more drastic way to form a new species though in this fallen world it compromises the health of the animal. In the ideal world God originally made all such new species would be healthy, but I digress.
Over time, genetic diversity will increase in both elephant seals and cheetahs as mutations accumulate.
Surely there can be no argument that in these cases there had to have been greately reduced genetic diversity in each new population in relation to the parent population, because that's the inevitable situation with the founding of a new population from a small number of individuals.
There is also no doubt that they will become more genetically diverse after the genetic bottleneck, as every single study has shown. They are also different from other species that they share a common ancestor with because of the accumulation of mutations in each lineage.

This message is a reply to:
 Message 238 by Faith, posted 08-11-2017 7:17 PM Faith has replied

Replies to this message:
 Message 276 by Faith, posted 08-14-2017 10:53 AM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


Message 274 of 908 (816965)
08-14-2017 10:48 AM
Reply to: Message 272 by Faith
08-14-2017 10:46 AM


Re: the usual silly wrong linear analogy
Faith writes:
There has to be selection from the genetic diversity in order to get a new variety or breed or race or species, and if it isn't selected it's just scattered new phenotypes in a large population, which is not evolution, which means change in the population. If you call everything evolution you are just playing a semantic game and confusing things.
Selection for an allele does not stop mutations from happening. It never stops. If you select for one allele of one gene then there are still tens of thousands of other genes that are mutating, and new phenotypes will be selected for.

This message is a reply to:
 Message 272 by Faith, posted 08-14-2017 10:46 AM Faith has not replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


Message 275 of 908 (816966)
08-14-2017 10:51 AM
Reply to: Message 260 by Faith
08-13-2017 4:06 AM


Re: the usual silly wrong linear analogy
Faith writes:
"Without a change in allele frequencies?" You are really not getting this. The founding population has the different allele frequencies from their parent population. It is those new allele frequencies that bring out the larger head and jaws over a number of generations of sexual recombination among those new allele frequencies. It is you who aren't thinking.
New mutations in those same genes will change the head and jaw, and they can be selected for. Once those new phenotypes are selected for and become dominant in the population, new mutations occur in those same genes for the head and jaw and can be selected for. This repeats over and over and over and over. Mutations continue to change genes, even after they have been selected for.

This message is a reply to:
 Message 260 by Faith, posted 08-13-2017 4:06 AM Faith has replied

Replies to this message:
 Message 278 by Faith, posted 08-14-2017 11:05 AM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


(1)
Message 277 of 908 (816969)
08-14-2017 11:05 AM
Reply to: Message 276 by Faith
08-14-2017 10:53 AM


Re: the usual silly wrong linear analogy
Faith writes:
Adding genetic diversity is not evolution, there has to be selection to get evolution, meaning changes in a whole population.
Evolution is the repeated process of adding genetic diversity and then selecting for that added genetic diversity. it never stops unless the lineage goes extinct. It never hits a dead end because new phenotypes and new genetic diversity is continually produced so that there are new things to select for.
You can theoretically have lots of new mutations scattered through a population that is not forming a new variety or species.
You can also have new mutations that are forming new species, such as the differences between the chimp and human genomes that is responsible for the physical differences between those two species.
As a matter of fact, however, you are exaggerating the occurrence of beneficial mutations since the vast majority are not beneficial and don't occur in the sex cells anyway where they could be passed on.
Mutations do occur in sex cells, and I can site multiple papers demonstrating that each human is born with 50-100 new mutations that occurred in the sex cells of their parents. Those mutations will be passed on.
If you think I am exaggerating beneficial mutations, then you need to a scientific reference demonstrating that fact.

This message is a reply to:
 Message 276 by Faith, posted 08-14-2017 10:53 AM Faith has replied

Replies to this message:
 Message 279 by Faith, posted 08-14-2017 11:07 AM Taq has replied

  
Taq
Member
Posts: 10021
Joined: 03-06-2009
Member Rating: 5.3


(1)
Message 280 of 908 (816975)
08-14-2017 11:20 AM
Reply to: Message 278 by Faith
08-14-2017 11:05 AM


Re: the usual silly wrong linear analogy
Faith writes:
In general discussions of mutations it is usually made clear that beneficial mutations that occur in the sex cells where they could be passed on are extremely rare, and to expect them to occur with the rapidity you are now describing contradicts that general knowledge.
Then reference "general knowledge" and show that this is true. Assertions don't cut it.
Also, simple math shows that you are wrong. If there is a possible beneficial mutation in a gene then it doesn't take that many humans to get that beneficial mutations. The diploid human genome is 6 billion bases, and the human mutation rate is about 100 mutations per person per generation. If there are 3 possible base changes at every locus, that is 18 billion possible mutations. 18 billion divided by 100 is 180 million. You only need 180 million births to get that one beneficial mutation.
So I argue that all it takes is the mixing of the gene frequencies in the original founders by sexual recombination over whatever number of generations it takes to homogenize the gene pool in the whole population.
But that isn't what we observe happening. We observe that new mutations produce new phenotypes which are then selected for. Your claim is contradicted by observations.

This message is a reply to:
 Message 278 by Faith, posted 08-14-2017 11:05 AM Faith has not replied

  
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