I am familiar with the case of equino original was a small animal in south America , as it moved to Asia it evolved into a horse what ever the reasons. Due to some mutation a family have in all children six fingers and so on I can name many more cases , If black man come from Africa and moved into area were there is less intense sun he with generation should reduce its melanin pigmentation. 10 years ago Neanderthal was a subspecies and there could not be an exchange . Now we accept Neanderthal interbreed with modern man , So I am an offspring I don't know you might be a modern man . There is the classic case of 2 colors of butterfly on the birch three, where the birds selected to eat the white ones . do you want more , to educate me in evolution.