Question

5. Below is a data set on the wing coloration in the scarlet tiger moth (Panaxia dominula). Coloration in this species has been shown to behave with non-Mendelian inheritance (the type is ______________ _____________ ). Show your work for parts a-e below.

White-spotted (AA)                       1,350

Intermediate (Aa)                        2,000

Little spotting (aa)                            650

1. Calculate the frequency of the A allele.

2. Calculate the frequency of the a allele.

3. Calculate the frequency of AA genotype.

4. Calculate the frequency of Aa genotype.

Answer 1

Coloration in this species has been shown to behave with non-Mendelian inheritance the type is incomplete dominance (intermediate in phenotype, suggesting an incomplete type of dominance) .

Allele frequency refers to how common an allele is in a population. It is determined by counting how many times the allele appears in the population then dividing by the total number of copies of the gene.

Given: White-spotted (AA)= 1,350

Intermediate (Aa) = 2,000

Little spotting (aa) = 650

Formula:

Frequency of allele A= Number of copies of allele A in population/ total number of copies of the gene 1)Frequency of allele A=1350+1000/3000

=0.78 or 78%

(note:1350 for AA, 2000 for Aa therfore A is1000)

2)Frequency of allele a= 1000+650/3000= 0. 55 or 55%

Genotype frequency is how often we see each allele combination,

3)Frequency of AA genotype= 1350/3000=0.45

4)Frequency of Aa genotype= 2000/3000=0.67