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BioFlix: Allele Frequencies

by Pearson
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Variation is found in human populations and in other populations, such as this population of island beetles. Color in these beetles is determined by different versions of a gene -- different alleles. Green is the dominant trait, so green beetles have two green alleles or a green allele and a brown allele. Brown beetles have two brown alleles. By counting the brown alleles and green alleles, we can calculate that this population has 30% brown alleles and 70% green alleles. The frequency of brown alleles is greater than the frequency of brown beetles because some green beetles have a brown allele. Allele frequencies change as populations evolve.
Variation is found in human populations and in other populations, such as this population of island beetles. Color in these beetles is determined by different versions of a gene -- different alleles. Green is the dominant trait, so green beetles have two green alleles or a green allele and a brown allele. Brown beetles have two brown alleles. By counting the brown alleles and green alleles, we can calculate that this population has 30% brown alleles and 70% green alleles. The frequency of brown alleles is greater than the frequency of brown beetles because some green beetles have a brown allele. Allele frequencies change as populations evolve.