A geneticist crossed pure breeding black mice (BB) with pure breeding brown mice (bb). All the mice in the F1 (first) generation had black coats. When these mice were crossed, they yielded 961 black-coated mice, and 317 brown-coated mice. The Punnett square below describes this cross. The numbers 1 to 4 are shown instead of the genotypes for the offspring.



Which of the genotypes, if any, is MOST likely to occur in the second generation that is shown in the Punnett square above? (2 points)

Group of answer choices

Bb