The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
If the alleles for short tail length is ss then it would be opposite for long tail length such as SS and if the long gene is in front then it will have the long alleles such as Ss
