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Analysis of contact between two chromosomal races of house mice in northern Italy show that natural selection will produce alleles that bar interracial matings if the resulting offspring are unfit hybrids. This is an important exception to the general rule that intermixing races will not tend to become separate species because the constant sharing of genes minimizes the genetic diversity requisite for speciation.
The climatic and geographic history of the Pleistocene and Holocene periods modified the distribution of the bird population in the South American forests. Forest birds are found dispersed in the Yungas and Paranese areas with only minimal infiltration of the Chaco woodland, indicating an atmospheric change during the interglacial periods. In the Chaco lowlands, the interactions between non-forest birds reveal the existence of presence of a forest belt along the Bermejo and Pilcomayo rivers.
J.A. Coyne wrongly asserted that neodarwinism includes allopatric evolution but not sympatric evolution. Allopatric evolution occurs among geographically isolated populations, whereas sympatric evolution occurs within one species' entire population. Both are neodarwinian since each results from natural selection of genetic variation. Also, Coyne failed to recognize that the molecular models used to illustrate how genetic changes bring on speciation are most useful when researchers acknowledge that both inherited J.A. Coyne wrongly asserted that neodarwinism includes allopatric evolution but not sympatric evolution. Allopatric evolution occurs among geographically isolated populations, whereas sympatric evolution occurs within one species' entire population. Both are neodarwinian since each results from natural selection of genetic variation. Also, Coyne failed to recognize that the molecular models used to illustrate how genetic changes bring on speciation are most useful when researchers acknowledge that both inherited epigenetic and genetic changes affect speciation. and genetic changes affect speciation.
Barton, N.H. Hewitt, G.M. Adaptation, speciation and hybrid zones; many species are divided into a mosaic of genetically distinct populations, separated by narrow zones of hybridization. Studies of hybrid zones allow us to quantify the genetic differences responsible for speciation, to measure the diffusion of genes between diverging taxa, and to understand the spread of alternative adaptations. (includes related information) Nature. V341. P497(7) Oct 12, 1989. Wright, Karen. A breed apart; finicky flies lend credence to a theory of speciation. Scientific American. V260. P22(2) Feb, 1989.
A field test of differential host-plant usage between two sibling species of Rhagoletis pomonella fruit flies (Diptera: Tephritidae) and its consequences for sympatric models of speciation. Evolution.
Speciation in the Hawaiian drosophila: sexual selection appears to play an important role.
Originally posted by MrXYZ
reply to post by Conclusion1
Well, it DID take a very long time...around 3.5bil years
The number of new mutations in each individual plant might appear very small. But if one starts to consider that they occur in the genomes of every member of a species, it becomes clear how fluid the genome is: In a collection of only 60 million Arabidopsis plants, each letter in the genome is changed, on average, once. For an organism that produces thousands of seeds in each generation, 60 million is not such a big number at all.
On a rather positive note, the results of the US-German team show that in sufficiently large populations, every possible mutation in the genome should be present.
Originally posted by iterationzero
reply to post by Conclusion1
The researchers at the Max Planck Institute would seem to disagree with your interpretations of their findings:
The number of new mutations in each individual plant might appear very small. But if one starts to consider that they occur in the genomes of every member of a species, it becomes clear how fluid the genome is: In a collection of only 60 million Arabidopsis plants, each letter in the genome is changed, on average, once. For an organism that produces thousands of seeds in each generation, 60 million is not such a big number at all.
On a rather positive note, the results of the US-German team show that in sufficiently large populations, every possible mutation in the genome should be present.
But, hey, what do they know about their own research? Right?
Seriously, these attempts at "statistically disproving" evolution are about as effective as trying to do it thermodynamically. Which is to say, not at all.
Originally posted by MrXYZ
reply to post by iterationzero
That's what happens if you get your information from the Creation Institute, or such crap pseudo-scientific websites like layevangelism.com
Originally posted by Conclusion1
Originally posted by iterationzero
reply to post by Conclusion1
The researchers at the Max Planck Institute would seem to disagree with your interpretations of their findings:
The number of new mutations in each individual plant might appear very small. But if one starts to consider that they occur in the genomes of every member of a species, it becomes clear how fluid the genome is: In a collection of only 60 million Arabidopsis plants, each letter in the genome is changed, on average, once. For an organism that produces thousands of seeds in each generation, 60 million is not such a big number at all.
On a rather positive note, the results of the US-German team show that in sufficiently large populations, every possible mutation in the genome should be present.
But, hey, what do they know about their own research? Right?
Seriously, these attempts at "statistically disproving" evolution are about as effective as trying to do it thermodynamically. Which is to say, not at all.
And this relates to 8-12 changes in 120 million base pair how? This is talking about seeds that r produced. This has nothing to do with what I said. So....seriously these attempts to thwart a mathematical fact, not statistics, is about as effective as saying something came from nothing. Which is to say, not at all. If that is what you are saying.
From your link.
true multicellular organisms must solve the problem of regenerating a whole organism from germ cells (i.e. sperm and egg cells), an issue that is studied in developmental biology.
Originally posted by Conclusion1
reply to post by MrXYZ
From your link.
true multicellular organisms must solve the problem of regenerating a whole organism from germ cells (i.e. sperm and egg cells), an issue that is studied in developmental biology.
Hmm. Wow. Those multicellular organisms must be pretty intelligent to solve that problem. That would put them billions of years ahead of us in the understanding of biology. Okay listen. They are encoded with a program. I mean look at it. It is a superbly designed instrument to figure things out. You believe that it was caused by accident. I believe it was cause with intention. To seek out new life. To find new civilizations. To boldly go where no multicellular organism has gone before.edit on 30-3-2011 by Conclusion1 because: (no reason given)
Originally posted by Conclusion1
reply to post by MrXYZ
Exactly. I came to a different conclusion. Yes I know you will believe them. Sheep follow their Sheppard.