In a species of 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 of a short-haired individual and a long-haired individual, it means that the short-haired individual must be heterozygous (Ss) and the long-haired individual must be homozygous recessive (ss). This is because the only way the offspring can inherit both short and long hair is if they receive one copy of the short-hair allele from the heterozygous parent and one copy of the long-hair allele from the homozygous recessive parent. If the short-haired individual was homozygous dominant (SS), then all the offspring would be short-haired, and if the long-haired individual was heterozygous (Ss), then some of the offspring would be long-haired and some would be short-haired in a predictable ratio.

In a Species of Mice, Short Hair Is Dominant to Long