Mapping Studies Have Showed That Within a Group of Mutants

Mapping studies have showed that within a group of mutants with the same growth requirements (i.e., the same overt phenotype) , individual mutations are on different chromosomes.This indicates that

A) the same gene governs all the steps in a particular biological pathway.
B) different genes can govern different individual steps in the same biological pathway.
C) different genes govern the same step in a particular biological pathway.
D) all biological pathways are governed by different genes.
E) genes do not govern steps in biological pathways, but proteins do.

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