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Jurassic yeast!
Aren’t they supposed to be sterile? :
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No, they’re all (supposed to be) females.
Crap, don’t get me started on yeast mating type and diploid nomenclature! :
Sorry Tom, I was making another really bad Jurassic Bock joke. :-[
Hah! I totally missed that, but I get it now. ;D
The thing that irritates me about the nomenclature is that the two haploid mating types are a and α. a and α. How stupid can it get? I understand a and b or α and β, but a and α?! Come on!
One of my old mentors worked on yeast mating type switching and sterility research decades ago and said she had the same objections, but no one listened.
Now see, if you studied knots as a Scout you would know α is a half hitch to the right, and β is a bowline (or two Ses in German, [think Weiβbier]). 
Yeast Scouts know this.
+1