I have always said that blue-eyed children with skin darker than pale had dark-eyed ancestors. Now that we know blue eyes are a mutation, I guess we have to say that we all had dark-eyed ancestors.
Another thing I have often mentioned is that children with lots of gooey ear wax had ancestors from cold places. It turns out to be only partially true. In fact, eax wax consistency is genetically determined: the wet type, which is dominant, and the dry type, which is recessive. Asians and Native Americans are more likely to have the dry type of cerumen (grey and flaky), whereas Caucasians and Africans are more likely to have the wet type (honey-brown to dark-brown and moist). For more than you ever wanted to know about eax wax:
http://www.expasy.org/spotlight/back_issues/067/
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