Lab4_Worksheet_BIO120Fall2021-topost

Table 4-4 . Chi-square test for Case 1 Genotype AA homozygotes Aa heterozygotes aa homozygotes Total Observed ( O ) 4 10 5 19 Expected ( E ) 4.26 9.47 5.26 19 O  E -0.26 0.53 0.26 (O  E) 2 0.0676 0.2809 0.0676 (O  E) 2 / E 0.0159 0.0297 0.0159  2 = 0.06 Null hypothesis: The fish population is at Hardy-Weinberg equilibrium Degrees of freedom ( df ) = 1 At P = 0.05 and df = 1, the critical  2 value is 3.84 Do we reject or not reject the null hypothesis? We do not reject the null hypothesis. Is this fish population in Hardy-Weinberg equilibrium at this locus? Yes Is this the result we expect? Explain why or why not. Yes BIO120 Fall 2021 Page 3

Table 4-8 . Data table for Case 3: Genetic Drift Gen Frequency of A allele # of A alleles # of a alleles Gen Frequency of A allele # of A alleles # of a alleles Parent 0.5 1 to 5 6 to 10 11 0.7 1 to 7 8 to 10 1 0.6 1 to 6 7 to 10 12 0.2 1 to 2 3 to 10 2 0.3 1 to 3 4 to 10 13 0.5 1 to 5 6 to 10 3 0.2 1 to 2 3 to 10 14 0.5 1 to 5 6 to 10 4 0.4 1 to 4 5 to 10 15 0.5 1 to 5 6 to 10 5 0.3 1 to 3 4 to 10 16 0.3 1 to 3 4 to 10 6 0.5 1 to 5 6 to 10 17 0.2 1 to 2 3 to 10 7 0.4 1 to 4 5 to 10 18 0.1 1 2 to 10 8 0.7 1 to 7 8 to 10 19 0.1 1 2 to 10 9 0.8 1 to 8 9 to 10 20 0 10 0.9 1 to 9 10 21 Table 4-9 . Class data for Case 3: Genetic Drift Enter in each cell below (one per student) the number of generations it took for one of the alleles to disappear 7 5 11 8 4 8 7 8 7 7 27 20 23 Mean = Do you predict that the mean number of generations it takes for an allele to disappear would be higher or lower if the population was larger (e.g., if you rolled 100 dice)? BIO120 Fall 2021 Page 6