part d assigning genotypes for codominant alleles

Then the change in p would include loss from forward mutationĪnd gain from back mutation likewise, change in q would include Let the frequency of D = p, and the frequency of d = q, forward mutation rate = u, and back mutation rate = v The d allele will be more frequent, as the forward mutation ( D to d) occurs at a higher rate than the back mutation. Therefore, in the next generation the frequency of So the recessive allele makes up 1/3 of the total alleles in the

Now the heterozygotes make up 2/3 of the surviving population, Is: Homozygous dominant = p 2 = 0.25 Heterozygotes = 2pq = 0.5 Homozygous recessive = q 2 = 0.25Īfter the viral epidemic, the only cats left are homozygous dominantĪnd heterozygotes: Homozygous dominant = p 2 = 0.25 Heterozygotes = 2pq = 0.5 Homozygous recessive = q 2 = 0.25 The frequency of the black allele in the next generation willīefore the virus comes through, the frequency of the three genotypes Then only the recessive (black) allele will be left in the population If only black cats are left standing after the virus goes through, However, doing so would ignore the contribution of recessive allelesįrom the heterozygotes in each population. Number of recessive individuals from the two populations and toĭerive q from that - i.e., take the square root of (4 + 54). = 0.22 Frequency of black cats in the next generation = q 2 = (0.22) 2 = 0.0484.Ī potential source of error in this problem is to simply add the

In the merged population - Frequency of recessive allele q = ((400 x 0.1) + (600 x 0.3))/1000 In the larger population - Frequency of the recessive phenotype = (q 2) 2 = 54/600 Frequency of the recessive allele = q 2 = 1/10 = 0.3. In the smaller population - Frequency of the recessive phenotype = (q 1) 2 = 4/400 Frequency of the recessive allele = q 1 = 1/10 = 0.1 Answer key to practice problems - Genetics 371B Autumn 1999

Part d assigning genotypes for codominant alleles