Question

Brown hair is dominant to gray hair in bunnies. What are the genotype and phenotype ratios for a homozygous recessive female and a homozygous recessive male?

Answer 1

The genotype and phenotypic ratios for a cross between a homozygous recessive female and a homozygous recessive male rabbit would both be 100% homozygous recessive (gray hair), as both parents can only contribute the recessive allele.

Step-by-step explanation:

When a homozygous recessive female rabbit is crossed with a homozygous recessive male rabbit, all of their offspring will also be homozygous recessive. This is because each parent can only contribute a recessive allele for gray hair. Since brown hair is dominant to gray hair in rabbits, but both parents lack the dominant allele, all offspring will also lack the dominant allele. Therefore, the genotype ratio will be 100% homozygous recessive (gray hair), and the phenotypic ratio will also be 100% recessive phenotype (gray hair).