Why can not it be argued that the genotype of any organism is a simple sum of individual genes? What proves the opposite?

If both the cell and the organism are integral systems, this is because the genotype is a system of interacting genes, both allelic and non-allelic, with each other.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.