Question

Table 2a: Chemical taste Test Paper Class Totals PTC Paper 90 12 #Tasters #Non-Tasters Thiourea Paper 183 19 #Tasters #Non-Tasters Sodium Benzoate Paper 41 61 #Tasters #Non-Tasters Control Paper o 102 #Tasters #Non-Tasters Table 2b: Allele frequency for the chemical tastes (Apply the Hardy-Weinberg Principle to determine the frequency of the traits) Trait PTC Thiourea Sodium Benzoate 2pg q2 = Frequency of the recessive genotype, q = Frequency of the recessive allele, p = Frequency of the dominant allele, 2pq = Frequency of the heterozygous genotype. Traits refer to those traits in Table 3a.

Answer 1

Answer:

Trait	PTC	Thiourea	Sodium benzoate paper
q^2	0.1176	0.1863	0.598
q	0.3429	0.4316	0.773
p	0.6571	0.5684	0.227
2pq	0.4506	0.4906	0.3509

PTC paper:

Frequency of non-taster genotype = q^2 = 12/102 = 0.1176

Frequency of non-taster allele = q= SQRT of q^2 = 0.3429

Frequency of taster allele = p = 1-0.34 = 0.6571

2pq = 2* 0.6571 * 0.3429 = 0.4506

Thioures paper:

Frequency of non-taster genotype = q^2 = 19/102 = 0.1863

Frequency of non-taster allele = q= SQRT of q^2 = 0.4316

Frequency of taster allele = p = 1-0.4316 = 0.5684

2pq = 2* 0.5684 * 0.4316 = 0.4906

Sodium Benzoate paper:

Frequency of non-taster genotype = q^2 = 61/102 = 0.598

Frequency of non-taster allele = q= SQRT of q^2 = 0.773

Frequency of taster allele = p = 1-0.773 = 0.227

2pq = 2* 0.227 * 0.773 = 0.3509