You Are Working on an Insulin-Binding Protein from Fish

Essay

You are working on an insulin-binding protein from fish.The beginning of the coding sequence of the gene is shown below.You find a mutant in the gene that cannot bind insulin (also shown below).Among a population of fish that have the gene for the mutant protein, you find one that produces a variant of this protein that can now bind insulin again (DNA sequence also shown below).What kind of mutation is this new variant? (Use a genetic rather than a biochemical classification.)