Question: The gene encoding the beta subunit of RNA polymerase from Escherichia coli is said to be orthologous to the rpoB gene of Bacillus subtilis. What

The gene encoding the beta subunit of RNA polymerase from Escherichia coli is said to be orthologous to the rpoB gene of Bacillus subtilis. What does that mean about the relationship between the two genes? What protein do you suppose the rpoB gene of B. subtilis encodes? The genes for the different sigma factors of E. coli are paralogous. What does that say about the relationship among these genes?

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