what is the genomic region responcible for suger digestion

[Siu Lab]

Hello, I am a nyc high school teacher.  I wish to teach recombinant 
DNA strategies to my students.  I had the idea to mutate Saccharomyces 
cerevisiae so that when fermented to produce root beer some strains 
would produce a sweeter tasting drink as others would produce a more 
bitter taste.  Do you have any suggestions.  I have a beginning 
knowledge on how to transform w/LiAc how to mini amd maxi prep how to 
recombin DNA and use libraries and shuttle vectors.  What I do noit 
know is what strain to start with, what region to knock out or 
manipulate and if this proposal is possible .  Any help you could 
offer would be great.  Thank you.

e-mail me at dymaxion at con2.com