I wonder if the stereotypical image of the "hot tempered redhead" has something to do with the old notions of the body being controlled by balances of humours... red = fire = yellow bile (srsly) = easily angered.
I've not heard about the redhead gene being "defective" but do know that it's pretty unusual in being both recessive and dominant (it can hide away for generations, but once it emerges it's there for a looooong time).
I do tend to find redheads more immediately attractive than other women. No idea why.
Actually, it's both big and
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