Which of the following is true about the genotype of the mouse shown below?

The genotype corresponding to a white mouse must be ff.

Explanation:

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In mice, the coat colour trait is determined by the brown dominant allele (F) and the white recessive allele (f).  For the coat of the mouse to be white (phenotype), its genotype must be homozygous recessive ff.

A dominant allele is one capable of suppressing the manifestation of a recessive trait, while a recessive allele needs to be homozygous in order to manifest in the phenotype.

The white mouse (image) must then have a genotype ff.

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Principle of dominance link

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