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Morning Meme-Man. I disagree with the comment about drifting "out of Kind". If this was the case then wolves and dogsmuttsmongrels would not be able to interbreed. It is the case that they can. @JupiterDrops, no, I am not confusing the pheno- and genotypes. Natural selection can only select for an already-born creatures at the phenotype level. The genetic trait is not expressed at genotype level, therefore it cannot be selected for. To come back to skin colours, I do believe that a kind of natural selecting has taken place here, but different to your worldview: In our world we find 3 basic physical traits amongst humans regarding their features, being mongoloid, negroid and caucasian. These can obviously be mixed up in one person presenting traits from all three groups simultaneously. Now, as a consistent creationist, I am led to believe that all people originally had a similar set of traits, mid-brown skin etc. At the time of Babel the worlds population was split according to the grandsons of Noah and these tribes would have possessed the genetic traits of their fathers being Shem. Ham and Japheth. Dispersing throughout the world would have caused certain genetic traits to become isolated due to them now no longer mingling as before. Outsiders with traits different to the "accepted" norm would likely have been selected against. In Creationist circles, we posit that there was an ice age after the global flood (we have a good mechanism to bring on an ice age, please ask if you are keen to know) , dark skinned people would not have survived well in Europe and north due to too little sunlight to produce Vit-E. (Interesting that Neandertals were dark skinned and had bone deformities consistent with what I have just mentioned.) We need to keep in mind that a completely new species is not a completely new KIND of animal. There are plenty of dung beetles that have sub-speciated in living memory to such an extent that through loss of genetic information, their reproductive organs no longer fit properly across the range and they are no longer able to reproduce. All from the same original species though.
Shane
Friday, January 27, 2012