Beliefs about race and ethnicity influence our cultures, politics, and relationships. What is race? What is ethnicity? This group explores those concepts.
I haven't taught biology in many years and my memory is rusty, but I remember teaching the class a law of speciation. As long as species have room to move into new territories, speciation and biodiversity will increase. A good example is grizzlies and brown bears evolving into polar bears as the clade moved north. The snowy environment caused obvious phenotypic changes. Fir color became white.
The irony that concerns racism is that when new territories are saturated and there's no new locations to evolve into, the opposite trend takes place. Cladistic variation shops and homogeneity kicks in. Instead of becoming more distinct, phenotypes homogenize.
The irony is that all humans eventually will be mulattoes.
Nice video, Flying Atheist. Thanks.