Re: [tied] Skin Cancer and Skin Pigmentation

merbakos wrote:

> Skin cancer usually occurs relatively late in life, and is not as
> important a consideration in selection for darker skin, since
> selection tends to favor young organisms over older ones in making
> its trade-offs. The more important reason for skin pigmentation is
> to protect folate stores from the effects of ultraviolet radiation.
> At the equator, extremely dark skin is needed. Moving toward polar
> latitudes, the ammount of sun exposure decreases until only a few
> months of the year provide sufficent exposure to provide for vitamin
> D synthesis, thus people in arctic and sub-arctic latitudes tend to
> have extremely fair skin that tans only lightly or not at all. An
> exception are the Inuit, who have very dark skin but eat a diet of
> 95% fish and marine mammal products, which are rich in vitamin D.
> There was thus no selective pressure for fairer skin.
>

Aham. And the skandinavians practice intense agriculture letting the
fish be eaten by inuits:-))
The food for inuits is/was less fish as normaly flesh. Cariboo & seals &
stuff.
BTW, the Amerindians living at the equatorial area differ much from the
negroid population of Afrika and the Aboriginis in Australia, are not
living in the equatorial area. Sri Lanka is not pretty in an equatorial
area but they have the same features as the negroid population of India
which is different, being an another kind of negroid population as the
one of India. Despite scientific ( more or less) explanatios for these
"changes", there are facts which cannot be dennied. The human being as
species has more rases and these rasses have more groups inside of them.

P.S. is eventualy the vitamin "L" the one who made the asiatic people to
be different from european and negroid one? Of course, rethoical
question which does not need to be answered:-)).

Alex