Hartwell and Colleagues Used the Yeast Saccharomyces Cerevisiae to Examine

Hartwell and colleagues used the yeast Saccharomyces cerevisiae to examine the cell cycle. However, most cell cycle mutants are lethal. How did the researchers get around this problem in their experiments?

A) The researchers grew S. cerevisiae cells carrying mutations alongside wild-type cells to counteract the effects of the mutation
B) The researchers grew S. cerevisiae as a haploid and used sub-lethal mutants for the genes of interest
C) The researchers grew S. cerevisiae as a diploid and maintained the mutations in a heterozygote
D) The researchers used conditional mutants