You Have Recently Purchased a Black Angus Bull Named Maxwell

Multiple Choice

You have recently purchased a black angus bull named Maxwell, an advertised "pure- breeding" champion, for which you pay $1,000,000. You mate Max with several cows that are verified pure breeding black angus cows. Several years later, you mate different pairs of Max's offspring (F1 x F1) and find that with certain pairings, approximately one fourth of the progeny are red (F2) . If B = black and b = red, what were the genotypes of the original cross, Maxwell x cow?

A) bb x bb
B) BB x BB
C) BB x bb
D) Bb x Bb
E) Bb x BB