Part A If the newly-founded island population of moths in your GENETIC DRIFT Lab
simulation contains 30 (BB) black, 12 (Bb) grey, & 3 (bb) white moths, what is
the frequency of the white alleleb alleles) for the moth-coloration gene in the
population
10%
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0.2 (or 20%)

Explanation:

The allele frequency can be calculated by counting how many times an allele appears in a population and then by dividing this number by the total number of alleles of the gene. In this case,

- Genotype BB = 30 moths >> 60 copies of the B allele

- Genotype Bb= 12 grey moths >> 12 copies of the B allele and 12 copies of the b allele

- Genotype bb= 3 white moths >> 6 copies of the b allele

The total number of copies of the gene is:

Dominant (B) allele = 60 (BB genotype) + 12 (Bb genotype) = 72 B alleles

Recessive (b) allele = 12 (Bb genotype) + 6 (bb genotype) = 18 B alleles

Then, 72 + 18 = 90 alleles  

Allele frequencies:

Dominant (B) allele = 72/90 =  0.8 (or 80 %)

Recessive (b) allele = 18/90 = 0.2 (or 20%)

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