etween different skin-color areas occurs? For example, if a white man immigrates to Africa, then he may face a problem with exposure to intense sunlight. Simply remaining under an umbrella can help us to protect ourselves in these areas. We may infer that we should become dark with time in living in these areas. Surprising we do not get too much black, though a little variation may observed. This is due to the genetic code once fed in our body, being difficult to reprogram. However after interracial marriages, certainly mixing of colors is observed in their generations. In the case black people moving to cloudy areas, they also do not turn too much white. A little change may occur as the melanin is no longer needed, and so it may be digested in upper layer in small quantity. If you move for few days, the little change in skin color is temporary and you will be recovered to your color after moving back to your area. Similarly if we start working in sunshine for few weeks, then after returning to the normal exposure, our blackened skin will be recovered soon, owing to the ever-going replacement of skin cells.
Going through all the discussion, we missed that is there something bad associated with black color? Yes there are demerits too. One demerit is certainly the one thought by you while reading this article; the cosmetic beauty. But there is another alarming demerit too. If someone with black skin moves to a country of white skinned people, he will lack of vitamin-D. The reason is that along with protection of his layer from harmful ultraviolet radiations, he is lacking to receive sufficient vitamin-D from the sunlight. So the migrating people are suggested to take vitamin-D medically, or sunbath may also give some benefit in this case.
Finally we conclude that whatever is happening normally in nature, blackening of the skin too, is due to some benefit or protection associated with us. Nothing is unimportant in nature, whether we like it or not, it is ultimately toward our benefit.
Edited by: Rajesh Bihani ( Find me on Google+ )