Other than gametes in eukaryotic cells, each somatic cell contains a complete set of an organisms genome which is why gene expression is necessary.
Explanation:
As the somatic cell contains the set of information relating the genome of the organism that is much likely similar to that of the parent cell. While, the somatic cell are not termed as those used in the reproduction process i.e sperm and ova. But, it is related to the different system inside the animal cell's body.
