Polygenic traits are traits that are controlled by several different genes. Usually these traits exist on a continuum of expression. For example consider height; there are not just two types of height but instead normal height exists on a fairly large continum of about 12 inches. Where you fall in this height range is caused by genetic material on several different genes. Other examples of the influence of multiple genese can be seen in skin color, autism, hypertension, hair color and eye color.
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