In mice, short hair is dominant to long hair. If a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that

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If both long- and short-haired offspring result from the cross, it means that the short-haired individual must have at least one dominant allele and one recessive allele, making it heterozygous. The long-haired individual could be either homozygous dominant (LL) or heterozygous (Ll), as the expression of the long hair trait only occurs when there are two recessive alleles present. Therefore, we cannot determine the genotype of the long-haired individual based on the offspring alone.

In Mice, Short Hair Is Dominant to Long Hair