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 × 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 × cow)?

Question

Quizplus · Accepted Answer

Maxwell must have been Bb (heterozygous) because some of his offspring produced red progeny when crossed with each other, indicating the presence of the recessive allele b. The cows were BB (homozygous dominant) to ensure that all F₁ offspring were black.

You Have Recently Purchased a Black Angus Bull Named Maxwell,an