Why must the quality and quantity of DNA in cells remain the same from generation to generation?

The quality and quantity of DNA in cells remain the same from generation to generation.

Explanation:

As all organisms depend on their DNA to live, and any changes in the amount or quality of DNA. It will lead to mutations or death of the organism. If DNA is changed then it will be difficult for the chromosomes to match up and offspring will not be produced. The quality must be maintained. Otherwise other system in the body will not work properly.