Chlamydomonas, a Unicellular Green Algae, Is Sensitive to an Antibiotic

Multiple Choice

Chlamydomonas, a unicellular green algae, is sensitive to an antibiotic, erythromycin. If mt- mating- type alga that is sensitive is mated with an mt+ cell that is resistant, and if the mt+ strain donates chloroplasts, what results do you expect and why?

A) All progeny are resistant because cpDNA is responsible for the resistant phenotype.
B) Approximately half the progeny are sensitive because cpDNA is responsible.
C) Approximately half the progeny are sensitive because this is the recessive trait.
D) All progeny are sensitive because sensitivity is the dominant trait.
E) All the progeny are sensitive because this is the recessive trait.