Final answer:
Nucleic acids, specifically DNA, have the most control over traits and inheritance.
Step-by-step explanation:
The nucleic acids, specifically DNA, have the most control over traits and inheritance. DNA contains the instructions for making proteins, which determine the structure and function of cells and ultimately the traits of an organism. Genes, which are sequences of DNA, determine specific traits by coding for the production of proteins with specific structures and functions. Therefore, nucleic acids play a crucial role in controlling traits and inheritance.