With evolution, often the line is less make us the Grab Him By The Ballot shirt that can survive and more we are good enough that we did survive to pass on genes even if just barely. Your teacher was likely trying to make you understand this by using extreme examples even if in many situations those examples could also equally be just as bad for the group though there are in fact multiple species that do practice of their own kind(especially after mating and in the insect kingdom).
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I love pale skin on a girl, like Grab Him By The Ballot shirt e. The biological explanation I’ve heard is that they can’t hide sickness. A Black person with jaundice shows no signs, nor do they have a pallor or show dark circles around the eyes. A person with flawless pale skin is clearly healthy, a person with flawless dark skin could have many issues that are hidden.