Genes are important in determining what you look like. what else plays an important role?

Genes plays an important role in proper metabolic function of the body as they code for proteins that instructs the cell to get activated and perform its vital functions.

Explanation:

The genes are functional unit of the DNA, these genes are coded by nitrogenous bases that carry hereditary information and also the genetic diseases that run in the family. In genetics, exerting genetic dominance is the more effective or predominant in action of body structures. Even a small mutation in the genetic coding of the germ cells can be carried over for generations.

Dominance and recessive genes.