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

50%

Explanation:

In this case, it is imperative to know each genotype >>

1. Genotypes for leg trait

- LL: normal legs

- Ll: deformed legs

- ll: very short legs  

2. Genotypes for fur trait

- BB: black fur

- Bb: brown fur

- bb: white fur

According to the data above, the parental cross is as follow:  

BBLl X bbLl  

The possible gametes for each parental genotype are as follow:  

Parental 1 >> 1/2 BL; 1/2 Bl

Parental 2 >>1/2 bL; 1/2 bl

Punnett square to calculate the possible genotypes of offspring:  

              bL      -             bl

BL    1/4 BbLL    -   1/4  BbLl

Bl     1/4 BbLl     -   1/4  Bbll

In consequence, the expected proportion of offspring with deformed legs and brown fur (genotype BbLl) is 1/2, i.e., 50%.

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