In laboratory mice,the "short tail" phenotype is dominant to the wild-type ("long tail")phenotype.However,crosses between any two short-tailed mice always produce mixtures of short- and long-tailed offspring.Assuming that tail length is controlled by a single locus,a likely explanation for these results is that the "short tail" allele is:

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The "short tail" allele is likely a recessive lethal allele, meaning that homozygous individuals for this allele do not survive, resulting in only heterozygous (short-tailed) and homozygous wild-type (long-tailed) offspring.

In Laboratory Mice,the "Short Tail" Phenotype Is Dominant to the Wild-Type