A mutant of Rhizobium leguminosarum is able to survive and reproduce in the laboratory outside of plant roots, but can no longer initiate root nodule formation. What type of genes are most likely mutated in this mutant?
A) rhz genes
B) myc genes
C) nif genes
D) nod genes

Question

Quizplus · Accepted Answer

The nod genes are responsible for initiating root nodule formation in Rhizobium species. Therefore, if a mutant is unable to initiate root nodule formation, it is most likely that the nod genes are mutated.

A Mutant of Rhizobium Leguminosarum Is Able to Survive and Reproduce