":Here I cannot answer your questions.  I did not write the above, it was in the original article, but towards the bottom.  Given the organization of the article, such as it is, I thought this kind of information belonged earlier, so I moved it up.  I do recall biologists using the word ""locus"" when refering to alleles, so I didn't question the choice of words.  But, as I say, I did not write this.

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