A white mouse has parents that are both white. The white mouse produces only brown offspring when it mates with a brown mouse. What genotype is the white mouse?
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4 points
homozygous dominant
homozygous recessive
insufficient information to determine genotype
heterozygous
The given information states that the white mouse has parents that are both white and produces only brown offspring when it mates with a brown mouse. This means that the white mouse must not have the allele for brown fur, as it is not passing it down to its offspring.
Since the white mouse only produces white offspring and does not have the allele for brown fur, its genotype must be homozygous recessive (ww).
Therefore, the correct answer is homozygous recessive.