Chapter 19, Problem 15P

You have isolated ( $1$) a streptomycin-resistant mutant ( ${\text{str}}^R$) of Chlamydomonas that maps to the chloroplast genome and ( $2$) a hygromycin $-$ resistant mutant ( ${\text{hyg}}^R$) of Chlamydomonas that maps to the mitochondrial genome. What types of progeny do you expect from the following reciprocal crosses?

${\text{mt}}^{+}{\text{str}}^R{\text{hyg}}^S\times {\text{mt}}^{-}{\text{str}}^S{\text{hyg}}^R$

${\text{mt}}^{+}{\text{str}}^S{\text{hyg}}^R\times {\text{mt}}^{-}{\text{str}}^R{\text{hyg}}^S$