When multiple colour forms of an organism exist in a population, the least abundant form is likely to increase in frequency.

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This phenomenon is known as frequency-dependent selection, where the fitness of a particular phenotype depends on its frequency relative to other phenotypes in the population. If one phenotype becomes too common, it may experience negative effects such as increased competition or predation, allowing the less abundant phenotype to thrive and increase in frequency.

When Multiple Colour Forms of an Organism Exist in a Population