1. In a sample of 500 tiger lilies, three genotypes occurred in the following nu
ID: 196001 • Letter: 1
Question
1. In a sample of 500 tiger lilies, three genotypes occurred in the following numbers. Calculate the genotypic and allele frequencies. (4 points)
Genotype AA Aa aa
Numbers 320 90 90
2. In a large population of ruby-throated hummingbirds, it was observed that the frequency of allele H was 0.4 and the frequency of allele h was 0.6. Calculate the expected Hardy-Weinberg equilibrium genotype frequencies. (3 points)
3. In a sample of 100 Hawaiians, it was found that 35, 20, and 45 individuals had blood groups MM, MN, and NN, respectively. Calculate the allele frequencies and the expected Hardy-Weinberg genotypic frequencies. Is this population in Hardy-Weinberg equilibrium? (5 points)
4. In Lop-eared rabbits, about 1 in 1000 has curly hair rather than straight hair; curly hair being due to a recessive gene. What is the proportion of curly alleles in the population? What are the frequencies of homozygous straight hair and of heterozygous straight hair individuals in this population? Assume that the population is in Hardy-Weinberg equilibrium. (3 points)
5. In a population of bark beetles in Minnesota, the following genotypes are observed:
AA (feeds under bark) 0.6
Aa (feeds on top of bark) 0.1
aa (feeds on leaves) 0.3
What are the allele frequencies and expected genotypic frequencies? Explain. (1 point)
Is the population in H-W equilibrium? (NOTE: You do not need to analyze this statistically. Make a judgment based on the proportions). (1 point)
List several biologically valid reasons why the observed population may not be in equilibrium. (3 points)
Explanation / Answer
1) Genotype frequency, p2 = 320/500 = 0.64.
Genotypic frequency of 2pq = 90/500 =0.18
Genotypic frequency of q2 = 90/500 = 0.18.
Allele frequency, p = 320+45/500 =0.73
q = 135/500 = 0.27.
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