Which pattern of inheritance results from individual organisms having many different genes working at the same time to control a single trait?

Polygenic trait.

Explanation:

A polygenic trait is the one that is regulated by more than one genes. Here, the total number of dominant alleles of all the genes determine the phenotype of the individuals.

For example, human skin color, height, eye color, the color of hair, etc. are polygenic trait and is regulated by more than one gene.

The pattern of inheritance results from individual organisms having many different genes working at the same time to control a single trait is called Polygenic Traits or / inheritance that are may be located near each other or even on separate chromosomes.