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

question 35

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.