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The answer is polygenic traits. Polygenic traits are determined by an interaction of multiple genes. As the name suggests, poly (Greek) means many, thus, polygenic means many genes. Many genes interact and together influence some phenotypic trait. Quantitative phenotypes are usually attributed to the polygenic effects.
Today, it is possible to measure minuscule effects of multiple genes and it is well understood that the one gene/one trait paradigm is largely incorrect. Most traits are affected by many genes, and most genes are involved in the development of multiple traits. A genome is all the genetic information of an individual. Each cell in the body contains the complete genome.