Question 4 1 pts The position of petal spots in Clarkia gracilis is controlled b

Question

Question 4 1 pts The position of petal spots in Clarkia gracilis is controlled by two codominant alleles (Pb and Pc) at a single locus. pbpb Basal Pcpc Central pbpc Double A previous researcher conducted a survey of a third population recording the phenotypes of different individuals. Her notes indicate that 51% of the population have petals with a basal spot. However, her notes do not indicate how many of those also have a central spot. If you assume that the population is in Hardy-Weinberg equilibrium, what proportion of the total population has both a basal and a central spot?

Explanation / Answer

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

Percentage of Homozygous Basal Genotype = 51%
Hence, Frequency of Homozygous Basal Genotype = 0.51
However, Frequency of Homozygous Basal Genotype = Frequency of Basal Allele * Frequency of Basal Allele
Therefore, Frequency of Basal Allele = 0.714
Therefore, Frequency of Central Allele = 1-0.714 = 0.286
Frequency of Codominant Double Genotype = 2*Frequency of Basal Allele * Frequency of Central Allele
Therefore, Frequency of Codominant Double Genotype = 2* 0.714 * 0.286 = 0.408
Proportion of total population that has both a basal and a central spot = 40.84% ANSWER

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