Problem Set 5- due on Wednesday November 3 before Exam 2.

For each of the following genotypes, state whether wildtype 
B-galactosidase is made when lactose is absent or present.  Some 
of the cells below are partial diploid.  Assume that each locus 
is wildtype unless otherwise indicated (for instance, the genotype 
at a is wildtype).
	
										lactose		lactose
										present		absent

a)	lacI lacP lacO lacZ lacY lacA

b)	lacI lacP lacOc lacZ- lacY lacA/ 
	lacI lacP lacO lacZ lacY lacA

c)	lacI-(allo) lacP lacOc lacZ lacY lacA/ 
	lacI lacP lacO lacZ- lacY lacA

d)	lacI lacP lacO lacZ lacY lacA/ 
	lacI-(O) lacP lacO lacZ- lacY lacA

e)	lacI lacP lacOc lacZ lacY lacA/ 
	lacI-(allo) lacP lacO lacZ- lacY lacA

f)	lacI-(O) lacP lacO lacZ lacY lacA/ 
	lacI-(allo) lacP lacO lacZ- lacY lacA

lacI-(allo) is a mutant affecting the allolactose binding site
lacI-(o) is a mutant affecting the operator binding site
lacOc is a constitutive mutant at the operator
lacZ- is a mutant (nonfunctional) B-galactosidase gene

g) how does glucose affect the expression of B-galactosidase?

h) what kind of operon is the trp operon?

i) name a eukaryotic operon?