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ReviewQuiz3formidterm2BIOL322EVOLUTIONARYBIOL-17541-SP2020.pdf
4/19/20, 8:56 PMReview Quiz 3 for midterm 2: BIOL 322 EVOLUTIONARY BIOL - (17541-SP2020)
Page 1 of 8https://canvas.csun.edu/courses/73196/quizzes/192059
Review Quiz 3 for midterm 2
Due Apr 21 at 9:25am Points 10 Questions 10 Available Apr 19 at 12:30pm - Apr 21 at 9:25am 2 days Time Limit None Allowed Attempts Unlimited
Instructions
Attempt History
Attempt Time Score
KEPT Attempt 2 4 minutes 10 out of 10
LATEST Attempt 2 4 minutes 10 out of 10
Attempt 1 18 minutes 2 out of 10
Score for this attempt: 10 out of 10 Submitted Apr 19 at 8:55pm This attempt took 4 minutes.
10 questions. 10 points.
Take the Quiz Again
1 / 1 ptsQuestion 1
A population of birds experiences directional selection for depth of the beak during a drought. Beak depth prior to the drought was 19 mm and the beak depth of survivors the next year following the drought was 23 mm. Also, the fraction of total phenotypic variance for beak depth that is explained by genetic variance (i.e., broad sense heritability) is 0.75. Ten percent of the genetic variance is accounted for by dominance variance and another 10% is accounted for
4/19/20, 8:56 PMReview Quiz 3 for midterm 2: BIOL 322 EVOLUTIONARY BIOL - (17541-SP2020)
Page 2 of 8https://canvas.csun.edu/courses/73196/quizzes/192059
epistatic variance and there is no evidence for genotype by environments interactions for bird bill traits. What is the expected response in beak depth of birds to selection?
1.2
0.3
2.0
2.4 Correct!Correct!
3
1 / 1 ptsQuestion 2
A neutral genetic locus has 2 alleles, A1 and A2. The frequency of the A1 allele is 0.23. What is the probability that the A1 allele will eventually be lost from the population?
0.5
0.23
0.1
0.77 Correct!Correct!
1 / 1 ptsQuestion 3
4/19/20, 8:56 PMReview Quiz 3 for midterm 2: BIOL 322 EVOLUTIONARY BIOL - (17541-SP2020)
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In a population with an effective size of 300, the initial heterozygosity at a neutral genetic locus equals 0.6. If the effective population size remains constant and the alleles at this locus continue to drift, what is the expected heterozygosity of the population after 100 generations?
0.51 Correct!Correct!
Correct AnswersCorrect Answers 0.51 (with precision: 2) Between 0.5 and 0.51 0.5078 (with margin: 0.0001)
1 / 1 ptsQuestion 4
In species A, you observe a value of heterozygosity, measured as nucleotide diversity ( ) at a neutral genetic locus equal to 0.025. If the mutation rate at that locus equals 1 x 10 per bp, what is the estimate of the effective population size?
-7
62,450 Correct!Correct!
Correct AnswersCorrect Answers 0 (with margin: 0) 62,500 (with margin: 50) Between 62,450 and 62,550
1 / 1 ptsQuestion 5
At this same locus in another taxon, B, estimated to have diverged from taxon A (in above problem) 10 million years ago, the same mutation rate occurs. If both loci evolved neutrally during their
4/19/20, 8:56 PMReview Quiz 3 for midterm 2: BIOL 322 EVOLUTIONARY BIOL - (17541-SP2020)
Page 4 of 8https://canvas.csun.edu/courses/73196/quizzes/192059
divergence, how many base differences would you expect between taxa at this locus?
1
12
20
2 Correct!Correct!
4
1 / 1 ptsQuestion 6
Answer 1:
Answer 2:
Imagine two species that differ in amino acid sequence at a particular locus. The nucleotide diversity for nucleotide sites with synonymous changes equals 0.025 and that for sites with nonsynonymous changes equals 0.01. If there are 8 substitutions at synonymous sites and 4 substitutions at nonsynonymous sites, calculate both the dn/ds
ratio 0.5 and the ratio of the McDonald-Kreitman test
1.25 . Do the two ratios lead to different conclusions
with respect to the nature of natural selection (being purifying
selection of positive selection) yes ?
0.5Correct!Correct!
4/19/20, 8:56 PMReview Quiz 3 for midterm 2: BIOL 322 EVOLUTIONARY BIOL - (17541-SP2020)
Page 5 of 8https://canvas.csun.edu/courses/73196/quizzes/192059
Answer 3:
1.25Correct!Correct!
yesCorrect!Correct!
1 / 1 ptsQuestion 7
Answer 1:
Answer 2:
Answer 3:
At each of three loci (A, B, C), there are 2 alleles each, 1 and 2 in a randomly mating population. The frequencies of allele 1 are 0.98, 0.45 and 0.6 at the 3 loci, respectively. Calculate the heterozygosity
at each locus, A 0.04 , B 0.5 , and C
0.48 , and the average heterozygosity across these 3
loci 0.34 .
0.04Correct!Correct!
0.0392 Correct AnswerCorrect Answer
0.039 Correct AnswerCorrect Answer
0.5Correct!Correct!
0.495 Correct AnswerCorrect Answer
0.49 Correct AnswerCorrect Answer
0.48Correct!Correct!
4/19/20, 8:56 PMReview Quiz 3 for midterm 2: BIOL 322 EVOLUTIONARY BIOL - (17541-SP2020)
Page 6 of 8https://canvas.csun.edu/courses/73196/quizzes/192059
Answer 4:
0.34Correct!Correct!
0.338 Correct AnswerCorrect Answer
1 / 1 ptsQuestion 8
Answer 1:
Answer 2:
Answer 3:
Answer 4:
Using the same data for allele frequencies at each of the 3 loci,
calculate the metric for gene diversity at A 0.04 , B
0.50 , and C 0.48 , and average gene
diversity 0.34 .
0.04Correct!Correct!
0.0392 Correct AnswerCorrect Answer
0.039 Correct AnswerCorrect Answer
0.50Correct!Correct!
0.495 Correct AnswerCorrect Answer
0.49 Correct AnswerCorrect Answer
0.48Correct!Correct!
4/19/20, 8:56 PMReview Quiz 3 for midterm 2: BIOL 322 EVOLUTIONARY BIOL - (17541-SP2020)
Page 7 of 8https://canvas.csun.edu/courses/73196/quizzes/192059
0.34Correct!Correct!
0.338 Correct AnswerCorrect Answer
1 / 1 ptsQuestion 9
Answer 1:
Answer 2:
Answer 3:
In a population of 1000 individuals, consider a locus with 2 alleles, with frequencies of p=0.3 for A1 and q=0.7 for A2. There are 290 A1A2 heterozygotes. What is the inbreeding coefficient
0.31 and how many A1 homozygotes
155 and A2 homozygotes 555 are
there in the population, respectively?
0.31Correct!Correct!
0.309 Correct AnswerCorrect Answer
0.3095 Correct AnswerCorrect Answer
155Correct!Correct!
555Correct!Correct!
1 / 1 ptsQuestion 10
4/19/20, 8:56 PMReview Quiz 3 for midterm 2: BIOL 322 EVOLUTIONARY BIOL - (17541-SP2020)
Page 8 of 8https://canvas.csun.edu/courses/73196/quizzes/192059
An island population has an allele frequency for A1 of 0.1. At the same locus in a population on the mainland the frequency of the A1 allele equals 0.9. If the rate of migration to the island equals 0.05 per generation, what will the frequency of A1 be in the island population after 4 generations of constant migration?
0.248 Correct!Correct!
0.180
0.275
0.20
0.214
Quiz Score: 10 out of 10
