What are your thoughts on genetic throwbacks (Atavism) ?

This is when an ancestral genetic trait reappears after a very long period of time. For example; a white couple giving birth to a child that appears to be of African descent. This can be attributed and traced back to a single African ancestor many generations ago.

People who are unaware of this would otherwise assume that they are black or biracial, based on the way they look. Sandra Laing (South African) and Anthony Lennon (Irish) are examples of this. So id like to know your thoughts on this
What are your thoughts on genetic throwbacks (Atavism) ?
What are your thoughts on genetic throwbacks (Atavism) ?
What are your thoughts on genetic throwbacks (Atavism) ?
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