Previous studies showed that the floral color of a plant is controlled by a sing

Question

Previous studies showed that the floral color of a plant is controlled by a single gene B. The allele B is dominant over allele b. The dominant phenotype is blue color, while the recessive is white. In a field, out of 1,000 flowers surveyed, only 40 are white. Assuming Hardy-Weinberg equilibrium in this population, please answer Questions 20 to 21. 20. What is the allele frequency for the B allele? 0.04 0.10 (C)0.20 0.80 0.98 21. What is the Rr genotype frequency in this population? 0.077 (B)0.180 (C) 0.320 0.480 None of the above

Explanation / Answer

As per Hardy-Weinberg Equilibrium, let
p = Frequency of Dominant Allele B
q = Frequency of Recessive Allele b
Also p + q = 1
Now,
p2 = Frequency of Homozygous Dominant Genotype BB
2pq = Frequency of Heterozygous Dominant Genotype Bb, bB
q2 = Frequency of Homozygous Recessive Genotype bb

Total = 1,000
Number of Recessive Phenotype = q2 *1000 = 40
Therefore, q = 0.2
Therefore, p = 1-q = 1-0.2 = 0.8 ANSWER

Frequency of Heterozygous Dominant Genotype = 2*p*q = 2*0.8*0.2 = 0.32 ANSWER

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