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

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

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the fossil record provides evidence of a common ancestor to many species.