Tail length in mice varies within a population. Scientists observed change in the distribution of an enguss
in a mouse population over time. At the genetic level, what has most likely happened to the allele for the
shortest tail lengths?

The allele changed from being dominant to being recessive.

The allele changed from being autosomal to being sex-linked.

The allele became less frequent than the alleles for longer tail lengths.

The allele began to code for long tail lengths instead of the shortest ones.