Chlamydomonas, a eukaryotic green alga, may be sensitive to the antibiotic erythromycin,...

Chlamydomonas, a eukaryotic green alga, may be sensitive to the antibiotic erythromycin, which inhibits protein synthesis in, prokaryotes. There are two mating types in this alga, . If an cell sensitive to the antibiotic is crossed with an cell that is resistant, all progeny cells are sensitive. The reciprocal cross ( resistant and sensitive) yields all resistant progeny cells. Assuming that the mutation for resistance is in the chloroplast DNA, what can you conclude from the results of these crosses?

¦ HINT: This problem involves an understanding of the cytoplasmic transmission of organelles in unicellular algae. The key to its solution is to consider the results you would expect from two possibilities: that inheritance of the trait is uniparental or that inheritance is biparental.