2006-06-23 04:59:36 · 10 answers · asked by plasmaisnoturs 3 in Science & Mathematics ➔ Biology
different melanin level in our skin... darker skin has higher melanin level and vice versa..
2006-06-23 05:03:36 · answer #1 · answered by samleong_86 2 · 0⤊ 0⤋
It is based on the fac that there are different levels of melanin produced. If you look at a punnent square for skin color you can see how the colors are formed. It also has to deal with the amount of sun exposure. People are darker towards the equator because it is an adaptation for fitness. THey get more sun there so they don't need as much absorbancy for vitamin d. SKin is lighter because it is an adaptiation to help absorb more sun and vitamin d will be produced more.
2006-06-23 05:16:54 · answer #2 · answered by answerman abc123 2 · 0⤊ 0⤋
The skin colours is given by the concentration of a pigment called melanin. this pigment is higher in the presence of sunlight (mostly uva, b, c) so the darker the skin the more is the protection for the cell dna from photo-damage. of course people closer to the poles and equator are darker than you would expect because it is there where the light is more intense.
2006-06-23 05:32:14 · answer #3 · answered by Prof. Hubert Farnsworth 4 · 0⤊ 0⤋
it is due to the genetically determined content of melanocytes (melanin- producing cells) in our skin. darker ones have more of them and albinos have none.
so a black person in africa can have an albino baby if there is a mutation and there you go u have the start of a new white race...in one generation...it doesnt need generations of adaptation to environment.it just takes bits of mutations and recombinations of dna to make this colorful human species.
2006-06-23 05:25:59 · answer #4 · answered by mnachuri 2 · 0⤊ 0⤋
if you read in the BIBLE after the fall of babel peoples languages were changed GOD sent man kind to the 4 courners of the earth man had to adabet to his enviorment NOT EVOLVE like some idiots say to his enviorment our skin had to adabt to where they were at rhat is why we have red yellow black white olive and all shades in between
2006-06-23 05:16:02 · answer #5 · answered by Charles W 6 · 0⤊ 0⤋
Adaptation.
2006-06-23 05:03:44 · answer #6 · answered by Jamie2 2 · 0⤊ 0⤋
its due to the diff. concentration of melanin.it protects the body from the hrmful effect of sunlight,and so in regions of more sunlight the skin of ppl is darker....so diff colours.
2006-06-24 04:17:23 · answer #7 · answered by upasanapuri30 2 · 0⤊ 0⤋
Evolution. The darker, the more sun exposure, and thus the more sun resistance.
2006-06-23 05:02:55 · answer #8 · answered by hunky 2 · 0⤊ 0⤋
it is an adaptive response to environmental conditions-- just like nose shape and size is another way...
Does evolution make sense?? IT can, if you think about it.
2006-06-23 05:10:42 · answer #9 · answered by Josefina 2 · 0⤊ 0⤋
is you white/black/purple/yellow/or what ever before I answer this question okay. {not tryin to be ruled}
2006-06-23 05:07:40 · answer #10 · answered by Monica 1 · 0⤊ 0⤋