The yellow colour in peas is the result of an enzyme that breaks down chlorophyll a which is green. The Y allele codes for the production of an enzyme that breaks down chlorophyll. The y allele is the result of a mutation in the Y allele. The y allele codes for an inactive form of this enzyme. (i)* Outline how the Y allele codes for the production of this enzyme and explain why the y allele codes for an enzyme with a different primary structure. _ _