Predict whether the GAL gens (Gal1, Gal7 Gal10 and Gal2) will be produced in the following yeast strains under the conditions noted. Use + to indicate that the GAL enzymes are synthesized at greater than basal levels, and 0 to indicate that the enzymes are not synthesized.
...................................... Galactose absent ......................... Galactose present
(a) wild-type
(b) Gal4-/Gal4-
(c) Gal3-/Gal3-
(d) Gal80-/Gal80-