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Blending theory was a pre-genetic theory about the inheritance of traits from parents to children. According to blending theory, the traits of the two parents would be averaged in the children in an even and equal manner; a child born to one tall parent and one short parent would always average its height based on the heights of the parents. In theory, this would result in homogenization of all traits over time. However, this did not account for mutations and other variations in trait inheritance, and blending theory was disproved with the study of genetics, which showed how dominant and recessive traits could be passed down in a variety of combinations. Today, blending theory is considered a discredited part of scientific history, and is taught as a progenitor of genetic theory but not as functional science.
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