The gene L determines hair length in rabbits. The gene B determines hair color. A rabbit with long, black hair is crossed to a rabbit with short, white hair. All the offspring have long, black hair. What are the genotypes of the parents?

Question

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The offspring all have long, black hair, indicating that long hair (L) and black hair (B) are dominant traits. The parent with long, black hair must be homozygous dominant (LLBB) to ensure all offspring have these traits, while the other parent must be homozygous recessive (llbb) for short, white hair.

The Gene L Determines Hair Length in Rabbits