How does dna influence physical traits

DNA influences your genotype but your phenotype is the dominant trait from the genes.

The traits of a living thing depend on the complex mixture of interacting components inside it. Proteins do much of the chemical work inside cells, so they largely determine what those traits are. But those proteins owe their existence to the DNA (deoxyribonucleic acid), so that is where we must look for the answer.

It's speed of rotation.