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That is the frequency of the A1 allele in a population composed of 20 A,A, individuals, 80 A1 A2 individuals, and 100 A2Az in show work that explains how the nawer was reached
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AI A = 20 A A = 80 A2 A2 = 100 Total 200 (N) Allele Frequency A - 2 (AA) + Aa Frequency of Al 2x20 + 80 200 40180 200 SON 128

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