The traits controlled by single genes usually represent "either-or" phenotypes, while traits controlled by many genes typically represent an entire range of different outcomes.

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Traits controlled by single genes typically exhibit discrete, "either-or" phenotypes, meaning that an individual either expresses the trait or does not. On the other hand, traits controlled by many genes often involve a combination of genetic and environmental factors, resulting in a wide range of potential outcomes rather than a clear-cut dichotomy.

The Traits Controlled by Single Genes Usually Represent "Either-Or" Phenotypes