In rabbits, the homozygous CC is normal, Cc results in deformed legs, and cc results in very short legs. The genotype BB produces black fur, Bb brown fur, and bb white fur. If a cross is made between brown rabbits with deformed legs and white rabbits with deformed legs, what percentage of the offspring would be expected to have deformed legs and white fur?

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25%For brown rabbits with deformed legs, the genotype must be BbCc. For white rabbits with deformed legs, the genotype must be bbCc. Crossing BbCc with bbCc, the probability of getting offspring with deformed legs (Cc) is 50% (since both parents are Cc, and Cc x Cc yields 1CC:2Cc:1cc). The probability of getting white fur (bb) is 50% as well (since one parent is Bb and the other is bb, and Bb x bb yields 1Bb:1bb). Therefore, the probability of both deformed legs and white fur is 50% (for deformed legs) times 50% (for white fur), which equals 25%.

In Rabbits, the Homozygous CC Is Normal, Cc Results in Deformed