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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.
Quantitative Traits. A quantitative trait is a trait that fits into discrete categories. This means that you can neatly categorize a trait. For example, if a species of plant had either red leaves or yellow leaves, and nothing in between, this would be a discrete trait.xcept for some rare special cases, the humans can only fit into one of four categories for the ABO part of their blood type: A, B, AB, or O. Since the ABO part of your bloodtype fits neatly into four categories, it is a qualitative trait. You can often represent qualitative traits with a number.