1.A gene locus called Q has just two alleles, Q and q. If the frequency of the Q
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Question
1.A gene locus called Q has just two alleles, Q and q. If the frequency of the Q allele is 0.7 and the frequency of the q allele is 0.3, and there are 100 individuals in the population (assume that the organism is diploid), how many Q alleles are present in the population? How many q alleles?
A. 100 of each allele
B. 140 Q alleles, 60 q alleles
C. 70 Q alleles, 30 q alleles
D. There is not enough information given to answer this question
2.Another gene locus, Z, also has two alleles: three genotypes are possible from the combinations of these alleles: ZZ, Zz, and zz. There are 20 ZZ, 25 Zz, and 5 zz (diploid) individuals in a population. How many total copies of the alleles of this gene are there in this population?
A. 50
B. 100
C. 25
D. There is not enough information given to answer this question.
3.How many Z alleles are present in the population described in question #2?
A. 65
B. 40
C. 25
D. There is not enough information given to answer this question.
4.How many z alleles are present in the population described in question #2?
A. 10
B. 25
C. 35
D. 50
E. There is not enough information given to answer this question.
5.What is the frequency of the Z and z alleles in the population described in question #2?
A. Frequency of Z = 0.65; frequency of z= 0.35
B. Frequency of Z = 0.5; frequency of z - 0.5
C. Frequency of Z = 1.0, frequency of z = 1.0
D. There is not enough information given to answer this question.
6.Calculate the frequencies of the three genotypes in the population described in question #2.
A. ZZ = .5, Zz=0.25, zz = 0.25
B. ZZ = 0.4, Zz = 0.5, zz = 0.1
C. ZZ = 0.25, Zz= 0.5, zz = 0.25
D. There is not enough information given to answer this question.
7.The ability to curl ones tongue is governed by a dominant allele. CC and Cc individuals can curl their tongues and cc individuals cannot. These genotypes occur at frequencies of 0.4, 0.5, and 0.1 for CC, Cc, and cc, respectively. What are the phenotype frequencies for tongue curlers and non-curlers?
A. Curlers, 0.9; non-curlers, 0.1
B. Curlers = 0.4; non-curlers = 0.6
C. Curlers = 0.5, non-curlers = 0.5
D. There is not enough information given to answer this question.
8.What are the frequencies of the two alleles C and c in the population described in question #7?
A. C = 0.6; c= 0.4
B. C = 0.65; c = 0.35
C. C = 0.5; c = 0.5
D. C=0.9; c = 0.1
E. There is not enough information given to answer this question.
9.In a human population, the genotype frequencies at one locus are 0.6 AA, 0.3 Aa, and 0.1 aa. What is the frequency of the A and a alleles, respectively?
A. A = 0.75; a = 0.25
B. A = 0.7; a = 0.3
C. A = 0.6; a = 0.4
D. There is not enough information given to answer this question.
10.In the snail example you did in studio, body color is governed by a single gene with two alleles G and g. If the frequency of the G allele in a certain population is 0.7 and the frequency of g is 0.3, what are the expected genotype frequencies if the population is in Hardy-Weinberg Equilibrium?
A. GG = 0.7, Gg = 0.2, gg = 0.1
B. GG = 0.3, Gg = 0.6, gg = 0.1
C. GG = 0.49, Gg = 0.42, gg = 0.09
D. GG = 0.4, Gg=0.4, gg = 0.2
E. There is not enough information given to answer this question.
11.If the genotype frequencies at a locus D are: DD = 0.81, Dd = 0.18, and dd = 0.01, assuming that the population is in Hardy-Weinberg Equilibrium, calculate the frequencies of the D and d alleles.
A. D = 0.81, d = 0.19
B. D = 0.9, d = 0.1
C. D = 0.99, d = 0.01
D. There is not enough information given to answer this question.
12.If, in the example described in question #11, all the information you had was that the dominant phenotype frequency was 0.99 and the recessive phenotype frequency was 0.01, could you still calculate the equilibrium allele frequencies?
A. Yes
B. No
13.Phenylketonuria is a rare autosomal recessive human hereditary disease. If this disease occurs at a frequency of 1 person in 10,000 (1 x 10-4), and the alleles are K for the normal gene and k for the mutant gene, what is the frequency of the k allele in the population? (You must assume the population is in Hardy-Weinberg equilibrium.)
A. 0.0001
B. 0.01
C. 0.1
D. There is not enough information given to answer this question
Explanation / Answer
1. C. 70 Q alleles, 30 q alleles
Number of Q allels present in the population = 100* 0.7 = 70
Number of q allels present in the population = 100* 0.3 = 30
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