Chapter 19, Problem 16P

You have isolated two petite mutants, $\text{pet1}$ and $\text{pet2}$, in Saccharomyces cerevisiae. When $\text{pet1}$ is mated with wild $-$ type yeast, the haploid products following meiosis segregate $2:2$(wild type $:$ petite). In contrast, when $\text{pet2}$ is mated with wild type, all haploid products following meiosis are wild type. To what class of petite mutations does each of these petite mutants belong? What types of progeny do you expect from a $\text{pet1}\times \text{pet2}$ mating?