Please also provide an explanation for the chosen answer. Q24.3. Within a group of mutants (genetically related organisms with slightly different genotypes) with the same overt phenotype, DN/ sequencing studies mapping the location of the mutations determined that mutations in different organisms 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 Q24.4. A bit of practice reading and interpreting networks. Q24.4 In the network below we see the functional relationships network of transcription factors, the genes encoding them, environmental factors and the genes responsible for a complex bacterial phenotype called heterocyst formation ( hgl, hep, and nif). Which interpretation of the figure is most reasonable? A. Calcium negatively regulates CcbP. B. The expression of gene pats leads to an increase in the expression of hgl. C. Nitrogen limitation "turns-on" hgl expression. D. The NtcA transcription factor can act both negatively and positively. E. C & D.