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why would for e.g a brown color allele not have the highest frequency in any given...

why would for e.g a brown color allele not have the highest frequency in any given population despite it being a dominant allele?
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Answer #1

The dominant or recessive property of an allele is not an indicator of the 'fitness' of the allele in real world populations. Allele frequencies are the result of a balance between selection and mutation, which produces the observed allele frequencies. If a particular allele is selected against, for any reason, ranging from sexual selection to predation, then the frequency of that allele will be naturally low in the population, even if the allele is dominant.

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