Within a group of mutants with the same growth requirement (i.e., the same overt phenotype), mapping studies determined that individual mutations were 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.

Question

Quizplus · Accepted Answer

Because the mutants have the same overt phenotype but are on different chromosomes, it indicates that different genes can govern different individual steps in the same biological pathway. This suggests that the pathway is regulated by a series of genes working together, rather than a single gene controlling all steps.

Within a Group of Mutants with the Same Growth Requirement