To solve this problem, we need to match the genes in List I with their corresponding products in List II. Let's analyze each gene:$\newline \bullet$A. Gene 'a':$\newline$ - Gene 'a' is responsible for coding the enzyme transacetylase.$\newline$ - This matches with II.$\newline \bullet$B. Gene 'y':$\newline$ - Gene 'y' codes for the enzyme permease, which facilitates the entry of lactose into the cell.$\newline$