In this exercise, you will use the cytochrome c oxidase i (coi) gene to investigate relationships among salmon species. (this gene encodes a protein that functions in the mitochondrial electron transport chain.) you will compare the coi gene sequences from your salmon test samples to the standard sequences for each salmon species. in order for the coi gene to be useful for distinguishing among the different salmon species, which three statements must be true?

In order for this gene to be useful in differentiating different salmon breeds, the specific coi gene sequences must be either found or absent in all individuals of a breed, be about the same among individual breeds unless a mutation is found in an individual, and different from the coi gene sequences of other breeds. If the coi gene is found to be the same between two or more salmon breeds, then another gene will be necessary in order to differentiate between breeds.