Part C Calculating expected genotype frequencies Next use t

Part C - Calculating expected genotype frequencies

Next, use the Hardy-Weinberg equation (p ² + 2pq + q ² = 1) to calculate the expected frequencies of genotypes C^GC^G, C^GC^Y, and C^YC^Y for a population in Hardy-Weinberg equilibrium.

Fill in the table with the expected frequencies for each genotype. Enter your answers to three decimal places.

21

47

106

20

173

Solution

1. Total number is 28, so the frequency of CG is 7 x 100 / 28 = 0.25, CY is 21 x 100 / 28 = 0.75

C^G = 0.25, C^Y = 0.75

C^GC^G = 0.25 x 0.25 = 0.0625, C^YC^Y = 0.75 x 0.75 = 0.56, 2C^GC^Y = 0.375

2. C^G = 0.51, C^Y = 0.49

C^GC^G = 0.51 x 0.51 = 0.2601, C^YC^Y = 0.49 x 0.49 = 0.2401, 2C^GC^Y = 0.1249

3. C^G = 0.51, C^Y = 0.49

C^GC^G = 0.51 x 0.51 = 0.2601, C^YC^Y = 0.49 x 0.49 = 0.2401, 2C^GC^Y = 0.1249

4. C^G = 0.73, C^Y = 0.27

C^GC^G = 0.73 x 0.73 = 0.5329, C^YC^Y = 0.27 x 0.27 = 0.0729, 2C^GC^Y = 0.3942

5. C^G = 0.56, C^Y = 0.44

C^GC^G = 0.56 x 0.56 = 0.3136, C^YC^Y = 0.44 x 0.44 = 0.1936, 2C^GC^Y = 0.4928