Traits that are "either/or" phenotypes (e.g., being color blind or not being color blind, having a blood clotting disorder or not having a blood clotting disorder) are usually controlled by ________ genes.

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Either/or phenotypes are controlled by single genes with alternative alleles that produce different phenotypes. This is known as Mendelian inheritance, where the genotype of an individual determines their phenotype for a particular trait. Polymorphic genes have multiple alleles, mutated genes have altered sequences that affect their function, and multiple genes control traits with continuous variation.

Traits That Are "Either/or" Phenotypes (E