Most flour beetles are black, but several color variants areknown. Crosses of pure-breeding parents produced the followingresults in the F1 generation, and intercrossing theF1 from each cross gave the ratios shown for theF2 generation. The phenotypes are abbreviated Bl, black;Br, brown; Y, yellow; and W, white.

a. From these results, deduce and explain the inheritance of thesecolors.

b. Write out the genotypes of each of the parents, theF1, and the F2 in all crosses.