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 a short-haired individual is crossed with a long-haired individual and both types of offspring result, it means that the short-haired parent must have carried the recessive long hair allele as well. Therefore the short-haired individual must be heterozygous, and the long-haired parent could be either heterozygous or homozygous for the recessive long hair allele.

In Mice,short Hair Is Dominant to Long Hair