iGenetics 3rd Edition by Peter Russell

Exercise 3

A temperature-sensitive mutation in yeast results in the production of a Gal80p protein in cells grown at the permissive temperature of 18°C but not at the restrictive temperature oF₂9°C. How will transcription levels of each of the MIG1 , GAL1 , GAL4 , GAL7 , and GAL10 genes change when yeast growing at the permissive temperature are shifted to the restrictive temperature when
a. both glucose and galactose are present
b. glucose, but not galactose, is present
c. galactose, but not glucose, is present
d. neither glucose nor galactose is present