Questions 36-37 make use of the following scenario. In snapdragons, flower color
ID: 59729 • Letter: Q
Question
Questions 36-37 make use of the following scenario. In snapdragons, flower color is determined by a single locus with two codominant alleles. CRCR is red, CRCW is pink, CWCW is white. In a population of these plants, 100 individuals were counted, and their flower color noted.
12 red
46 pink
42 white
36. What is the frequency of the CW allele?
A. .19
B. .65
C. .50
D. 162
E. None of the above.
37. If the population were in Hardy-Weinberg equilibrium, what would be the frequency of the heterozygous genotype?
A. .50 B. 18 flowers C. .46 D. 9/16
E. none of the above
Explanation / Answer
36. B. .65
Given that, p2 (CRCR) = 12/ 100 = 0.12; p (the frequency of CR allele) = 0.34
Since p+q = 1; q (the frequency of CW allele) = 1 - 0.346 = 0.65 (approximately = 0.66)
37. C. .46
Heterozygous genotype = 2pq = 2* 0.34* 0.65 = 0.442 (approximately 0.46); or it is given that number of pink flowers is 46. Means 2pq (the frequency of the heterozygous genotype) = 46/ 100 = 0.46
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