Skin color isn't Mendelian. There are several genes that control for it, instead of a simple on/off model. How light or dark a person's skin is, is controlled by the range of genes. That's why when a very light person has children with a very dark person, the color of the children is generally a blend.  Actually, sometimes two fairly dark people do produce a child who is phenotypically white, and threads with photos come up in the forum now and then (especially in Opposing Views). This is possible because the genes that control for light skin color are recessive. Each dark person in this case has to have about half white ancestry, and chance deals all the light genes from each parent to the child.  Two light-skinned parents may have a child who is slightly darker than either of them, but not greatly so. There was a very interesting discussion in SM about the Sandra Laing case, a phenotypically Negro woman who was ostensibly born to two white parents. This was before DNA testing could confirm paternity. I am convinced her parents were not as claimed, but others seem to be sure this type of throwback is possible in white parents who have non-perceptible non-white ancestry. I was imagining something similar... that's why the chances of having white offspring for a couple of 50w-50B individuals is not 25% as basic Mendelian laws indicate...    So for the feature skin color we have not ONE but a SET of genes (any idea how many?), I presume that ALL the genes in this set that control skin color have to be white in order to get a white person right? since white skin color is recessive, or maybe there are some that are recessive and other aren't?    That would explain why among white people there are different skin tones without having admixture with non-whites...     I assume that all the other genes that control all the other different features that actually make the different races different are also SETs of genes and not only one gene, let's say for the nose, skull and jaw shape, muscle distribution, etc...    But talking theoretically it IS possible for a couple of mixed individuals to produce pure offspring of one of the races involved in the mixing? I can imagine that the chance would be very low, but it's indeed possible?    Let's say we could get sperm and egg samples of the two individual and actually choose which particular sample to use in order to get a pure individual of a particular race, would it be possible? or am I missing any other constraint?