Researchers combined two yeast strains of opposite mating type; the a strain was resistant to chloramphenicol and the ? strain was sensitive to chloramphenicol. The diploid progeny were allowed to undergo several cell divisions, and then the cells were replica plated on glycerol medium with and without chloramphenicol.
-What results would you expect if mitochondria are inherited biparentally?
A)Some, but not all, yeast colonies found on the plate without chloramphenicol will also grow on the plate with chloramphenicol.
B)All of the yeast colonies on the plate without chloramphenicol will also grow on the plate with chloramphenicol.
C)Many yeast colonies will grow on the plate without chloramphenicol and no colonies will grow on the plate with chloramphenicol.
D)No colonies will grow on either plate.

Question

Quizplus · Accepted Answer

If mitochondria are inherited biparentally, the diploid progeny would inherit mitochondria from both the chloramphenicol-resistant and -sensitive strains. This would result in a mixed population of cells, some of which would be resistant to chloramphenicol due to the presence of resistant mitochondria, while others would be sensitive due to the presence of sensitive mitochondria. Therefore, some, but not all, yeast colonies would be able to grow on the plate with chloramphenicol, reflecting this mixed inheritance.

Researchers Combined Two Yeast Strains of Opposite Mating Type; the a Strain