STPM Biology - chapter 18: Revision essay question 4

4. Given a population of 35% of white mice. Knowing that the white colour skin is caused by the double recessive genotype, “aa”. Calculate the allele and genotype frequency for this population.

Answer


         White mice = 35
         Frequency of aa genotype, q² = 0.35
         Frequency of allele, q = 0.59
        
         Frequency of allele, p = 1 – q
                                             = 1 – 0.59
                                             = 0.41

         Frequency of genotype, AA = p²
                                                       = (0.41)²
                                                       = 0.17

         Frequency of genotype, Aa = 2pq
                                                      = 2 (0.41) (0.59)
                                                      = 0.48

         CHECKING:
            p² + 2pq + q²
         = 0.17 + 0.48 + 0.35
         = 1


Assignment submitted by L.Y., Kong,  S. H., Lim, S. C., Soo, C. W.