Evolution, Melanin And Brain Power
#2 Part 2
Melanin is only one aspect of evolution. I presume erik assumes that the only genetic differences between the various human species is color. If low melanin were simply geographical and if evolution had ceased when HSI, the African, evolved then indeed all Homo Sapiens would have the same capabilities but obviously in different stages of development.
We know however that evolution didn’t cease one hundred fifty thousand years ago when Homo Sapiens evolved from the Last Hominid Predecessor.
Let’s consider two anomalies that distinguish Homo Sapiens from all other mammals with the exception of the Great Apes. All other mammals are hairy whether they live on the Equator or the North Pole. All other mammals with the exception of the Great Apes have tails. Both Apes and HS at one time had tails. They are now vestigial.
The Great Apes who live in Africa are black beneath their hairy coats. Certainly melanin is less needed by the Hairy Apes than White HS in the temperate zones. Why haven’t Apes switched off their melanin genes?
If having high melanin has a protective benefit in the tropics and if the hominid predecessors had a full coat of hair which they surely must have what happened to it? Wouldn’t the hair have been more protective and beneficial than high melanin?
With the Apes the anthropoids diverge from the four legged standard of mammals. HS is the most erect of all. As I said in EMBP #1 in the evolution of new organs or changes to the organism the organism cannot add to the existing structure from new materials it can only convert other substances to fill the new needs. Thus it must be true that HS is relatively hairless because the hair was converted genetically to other uses. When the hair disappeared the predecessor of HS was black but much less protected from the sun because of the hair loss. So melanin had nothing to do with the tropical sun. HS was already black. He started looking around for clothes.
The tail also could be eliminated safely so that it too disappeared to be used in evolutionary changes elsewhere.
If the HS brain continues to evolve adding new capabilities the material to do so will have to be provided by the alteration of some other organ or substance such as melanin.
We know that evolutionarily great changes have occurred. The changes necessary for the organism to walk erect are astounding. And yet HS must have moved on all fours at sometime in its past. I can tell you this, geography had nothing to do in the alteration of our species so it could walk erect.
There are many things yet to be explained.