Inheritance of Skin Color in Human

How is human skin color inherited, and how has human skin color evolved in human history?

[gilbertevans]

The slides shown at 2:43 and 3:43 are not consistent with each other. The slide at 2:43 says that the alleles of the three genes behave in a Mendelian dominant/recessive manner. However, the slide at 3:43 states that with the triple heterozygote condition (AaBbCc) the phenotype is intermediate color. If the upper case alleles were dominant to the lower case then AaBbCc should produce a 'very dark color' phenotype, just like the homozygous dominant (AABBCC). The only way for AaBbCc to produce an intermediate color would be if those genes were working in a scheme of incomplete dominance. The correct way to view this three gene model is to view each pair of alleles as providing a 'dose' of melanin. So, AAbbCC (or AabbCc for that matter) has only two 'doses' of melanin - that would produce a slightly paler color than 'very dark', an even lighter colour would only have one 'dose' of melanin (AAbbcc, say, or aaBbcc, or aabbCC ...).

[godzillamegatron]

Skin color is determined by melenin products, melocytes size, survival of melocytes, fat and blood under the skin. For a total of 5 variables. That should give the 200+ combination of skin color of humans.

[RoccosVideos]

Great explanation. I really appreciate it.

[natyboops]

Good information... Thanks for sharing! Easy now to understand the so called black and white twins.

[austigm]

Thank you a lot for this slideshow, can you please tell me, can a white boy come from a caucasian woman and an african dark man? and at same time the white boy got married to a white non cocasian women and had a boy of the husband father color? is it possible?

[quicksilver]

This cant be correct. There has to be a way where only the dominant gene becomes prevalent in a mixed genetic basis. Meaning that the phenotype does not accurately reflect on the genotype. I say this because with Ethiopian genetics, it is very common to see a child with the same exact skin tone of only one parent, when both parents have polar opposite skin complexions. I myself am really dark-skinned as well as my dad but my mother has very lightskin. And then my brother is just as light skinned as my mother. This is very, very common within an Ethiopian household. To the extent that it's ridiculous to even question it. My uncle has five kids. His wife is very dark and he is very light. 4 of his children are very light to yellowish tan looking. The fifth one is light brownish. There is no way this theory can be true without acknowledging the fact that there has to be some sort of assertion of dominance with the dark genes.

[elrichotto]

Is it then possible for individuals of aabbcc and AaBbCc to have a baby of AABBCC?

[tiredugandan]

We are both dark skin but our boy is light skin. How is that possible

[hsugraduation]

I was told in school that skin color is controlled by 11 genes.