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Originally posted by logicize
reply to post by Quazga
I could be wrong, but I've never heard of a mammal mutating after birth. I have heard of them being born with a genetic defect or mutation and then passing that along. I would be interest in that though. Do you have any other examples?
Originally posted by johnsky
Evolution IS currently occurring in humans, and there ARE cases of mutations being beneficial to the individuals.
For instance, there are many cases arising in the eastern world, Arabia comes to mind, in which people are being born without Clavicles, (Without collarbones.)
The clavicle is not a mechanically necessary bone structure, in fact, in our standing form (as we are now) it actually impedes your capability to reach somewhat, not to mention is incredibly fragile and prone to damage.
In the past, back when we were crawling animals (you will find these bone structures on many other crawling animals), the clavicle was required to support the upper chassis of the body.
Now that we walk on our hind legs, the clavicle has outlived it's purpose.
These individuals being born without clavicles have a greater reach than those with clavicles, and increased flexibility, in that they can shift their shoulders forward to reach further.