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Incomplete dominance is an important concept in the study of genetics. It refers to a circumstance in which the two copies of a gene for a particular trait, or alleles, combine so that neither dominates the other. This creates a new phenotype or set of observable characteristics caused by the interaction of genetics and environment. In short, incomplete dominance is when neither gene is fully dominant, and the result is a brand new trait.
Evolutionary changes happen all the time. One of these genetic changes happens by chance and is called genetic drift. Learn more about what genetic drift is along with genetic drift examples.