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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.
Polygenic inheritance is when a single trait is controlled by 2 or more sets of alleles.A polygenic trait is one whose phenotype is influenced by more than one gene. 8 people found this useful. group of genes, that determines a number of characeristics of an organism= its phenotype. (phenotype= appearance i.e blue eyes, blond hair). so it says, its genes (more than one), that decides how u are going to look like. foe example: blue eyes, red hair, big, small, etc...