Exam 2 Key

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* denotes correct answer, the percentages in front of each answer give the percentage of students selecting that answer. As shown below, with the exception of seven questions (45, 3, 34, 1, 5, 21, and 44), the majority of students selected the correct answer for each question.



1.	Under the neutral theory, as the amount of selection on a protein 
	increases
27%	a.	The protein will evolve faster
40%    *b.	The protein will evolve slower
23%    c. 	The rate of evolution is unchanged
09%	d.	Both (a) and (c)

2.	Bob lives to be 100 and has one child, while Jill dies at age 20, just after 
	having twins 
10%	a.	Bob has higher fitness
80%	*b.	Jill has higher fitness
0%	c. 	Bob's fitness is five times that of Jill's 
10%	d. 	Both (a) and (c)

3.	Consider a locus with two alleles,  and let p = freq of allele A   
30%	*a.	p = freq(AA) + (1/2) freq(Aa)
10%	b.	p2 = freq(AA)
0%	c. 	p = 2 freq(Aa)
60%	d. 	Both (a) and (b) are correct

4.	Suppose freq(AA) = 0.5 and freq(aa) = 0.4.  What is the frequency of 
	allele A?
16%	a.	0.50
68%	*b.	0.55
11%	c. 	0.60
04%	d.	0.40

5.	Suppose the fitnesses of the genotypes AA: Aa: aa are 1 : 1 : 0.9. 
0%	a.	Selection fixes allele a
40%	*b.	Selection fixes allele A
50%	c. 	Selection maintains both alleles
10%	d. 	Selection fixes genotype Aa

6.	Dinosaurs were found 	 
0%	a.	 In the Phanerozoic Eon
0%	b. 	 In the Mesozoic Era
10%	c. 	 In the Jurassic Period
90%	*d. 	All of the above

7.	 Plants first appeared on land
62%	*a.	In the Silurian 
10%	b. 	In the Devonian
10%	c. 	In the Permian
18%	d. 	In the Cambrian 	 
  
8.	 The age of Reptiles was
30%	a.	The Paleozoic Era
57%	*b. 	The Mesozoic Era 
6%	c. 	The Cenozoic Era
7%	d. 	The Tertiary Period

9.	Which is the correct statement?
70%	*a.	Mammals and dinosaurs appeared at roughly the same time
15%	b. 	Trilobites went extinct at the end of the Cambrian
4%	c.	Angiosperms appeared in the Precambrian Eon
11%	d. 	All the above are correct

10.	Buffon 
1%	a.	Founded population genetics
0%	b.	Is the name of the ASU mascot
89%	*c. 	Suggested that species can become modified over time
9%	d.	Suggested the inheritance of acquired characteristics	 
  
11.	Fisher
85%	*a.	Founded Population genetics 
  0%     b. 	Invented the little fish symbol found on the backs of cars
7%	c. 	Was the first to suggest that the earth very old
8%	d. 	Suggested the inheritance of acquired characteristics

12.	Lamarck
69%	*a.	Was the first to suggest a mechanism for evolution 
3%	b. 	Discovered microspheres
6%	c.	Was born after Charles Darwin's theory was published
21%	d. 	Suggested that organisms tend outgrow their environment

13.	 Which of the following WAS NOT used by Charles Darwin as 
	support for Evolution?
2%	a.	Biogeography
3%       b.	Functional Morphology
10%	c. 	Animal and Plant breeding
85%	*d.	Molecular Evidence		 
  
14.	 Which of the following observations proves evolution?
9%	a.	Vestigial characters
1%	b. 	Darwin's Finches
3%	c. 	Bats and Whales have closer chemistry than bats and birds
87%	*d.	None of the above as no single observation  proves a scientific 
		theory

15.	 Darwin defined evolution as
83%	*a.	Descent with modification
9%	b.	Natural selection 
0%	c. 	Major changes in organisms
7%	d. 	Survival of the fittest	 
  
16.	Which of the following figures DID NOT influence Darwin
3%	a.	Lyell and Hutton	 
1%	b. 	Malthus 
92%	*c. 	Kiruma
4%	d. 	All of the above influenced Darwin

17.	Sickle cell anemia
22%	a.	Was an example cited by Darwin	 
71%	*b.	Is an example of selective overdominance
1%	c. 	Killed the rabbits in Australia
6%	d. 	All of the above

18.	  The Biometricians
2%	a.	Supported Darwin 
4%	b.	Founded modern statistics 
5%	c. 	Included Galton and Pearson
89%	*d. 	All of the above 

19.	 The Mendelians
90%	*a.	Felt that mutation, not selection, drove evolution 
1%	b.	Were lead by Kimura
2%	c. 	Argued with Buffon
6%	d.	All of the above	 
  
20.	 Hardy-Weinberg assumes
8%	a.	 Random mating
0%	b. 	 Very large populations
1%	c. 	 No selection
91%	*d. 	All of the above
 
21.	 Under Hardy-Weinberg
40%	*a.	Allele frequencies never change 
10%	b.	Genotype frequencies never change
30%	c.	Both a and b
20%	d. 	None of the above

22.	 Under blending inheritance
7%	a.	Genetic variation is maintained
1%	b. 	Sickle cell alleles increase in frequency
86%	*c.	Half the genetic variation is removed each generation
5%	d. 	None of the above apply

23.	Bateson
83%	*a.	Was a Mendelian 
9%	b. 	Was a biometrician
7%	c. 	Was a founder of population genetics
1%	d. 	Lived before Darwin	 
  
24.	  Which statement is correct?
55%	*a.	 Darwin's original theory had a major genetic weakness
6%	b. 	 Darwin was well aware of Mendel's work
13%	c. 	 Darwin was the first to propose a mechanism for evolution
25%	d. 	All of the above

25.	Malthus 
3%	a.	Wrote "Essays on the Principles of Population" 
2%	b.	Influenced Darwin
5%	c.	Suggested that populations tend to outgrow their resources
89%	*d. 	All of the above	 
  
26.	Erasmus Darwin
3%	a.	Suggest all organisms had a common ancestor
1%	b.	Was impressed by the diversity generated by animal breeders
2%	c. 	Was Charles Darwin's grandfather
93%	*d. 	All of the above.

27.	 Evolution is regarded as a scientific fact because	
5%	a.	All other theories have been disproved
95%	*b. 	All attempts to disprove the theory over the last 120 years have 
		failed
0%  	c.	Scientists do not believe in god	 
0%	d. 	It accounts for 'freaks of nature" such as Sun Devils

28.	 Armadillos  and  Glyptodonts
1%	a.	Were both seen alive by Darwin in South American
5%	b. 	Were found in the same location
7% 	c. 	Were offered by Darwin as examples of  descent with 
			modification
87%	*d. 	Both b and c

29.	  Vestigial characters
3%	a.	Are under strong natural selection	 
9%	b. 	Suggest that organisms are always evolving more complexity	 
86%	*c. 	Are evidence of shared common ancestors
1%	d. 	Have clear functional roles

30.	 Fossils
1%	a.	Show a succession from very simple forms to very complex 
		forms	 
1%	b. 	Show multiple examples of transitional forms
2%	c. 	Offer direct evidence of descent with modification
96%	*d. 	All of the above	 
  
31.	 If the (single) parent-offspring regression is  0.4, what is the 
	heritability?
33%	a.	0.2
7%	b.	0.4
59%	*c. 	0.8
1%	d. 	0.1

32.	  If the two parents have values 10 and 20, their midparental value is
3%	a.	10	 
94%	*b. 	15
1%	c. 	20
2%	d. 	30

33.	 If the slope of a midparent-offspring regression is 0.25, then
4%	a.	The offspring mean is 10 units above the mean 
8%	b. 	 If the parents are 10 units above the mean, the offspring will be
		25 units above the mean
5%	c. 	The heritability is 2.50
83%	*d.   25% of the variation in the character is genetic	 
  
34.	  If the father is 10 units above the original mean and its offspring have 
	a mean  of  5 units  above the original  mean, then the heritability is 
8%	a.	 0.25
55%	b. 	 0.5
4%	c. 	 0.75
33%	*d. 	1.0

35.	  If the father is 5 units below the mean, while the mother is 5 units 
	above the  mean,  then the offspring mean will be 
60%	*a.	At the same value as the original mean
2%	b. 	5 units above the mean  if h2 = 0.5
2%	c. 	5 units below the mean if h2 = 0.25
36%	d.	Can't tell without knowing the heritability	 
  
36.	 The correlation for a trait is identical twins is 0.5, while for non-
	identical twins  it is 0.4.  The heritability of this trait is
13%	a.	0.1
76%	*b. 	0.2
6%	c. 	0.4
5%	d. 	0.5

37.	 If a trait shows the same correlation in identical and non-identical 
	twins, then
14%	a.	h2 = 1 
72%	*b.	h2 = 0 
11%	c. 	All the trait variation is genetic 
3%	d. 	the midparental value is zero

38.	For a locus with two alleles, if the frequency of  genotype AA is 0.5
1%	a.	freq(A) = Ã0.20
25%	b. 	Can't give an exact value for freq(A) from this data 
8%	c. 	freq(A)  is at least 0.5
65%	*d. 	Both b and c

39.	 If p = freq(A) = .25, then under Hardy-Weinberg, freq(aa) equals
10%	a.	0.252
4%	b. 	2*0.25*0.75
82%	*c. 	0.752
3%	d.	 Ã0.25	 
  
40.	  The neutral theory
9%	a.	States that selection is not important	 
9%	b. 	States that there are no favorable mutants
58%	*c. 	States that it is mainly neutral mutants that are fixed
23%	d. 	None of the above
 
41.	  Molecular clocks
16%	a.	Refer to the same constant rate at which all proteins evolve	 
7%	b.	Prove the neutral theory
11%	c. 	Run faster in proteins under more selective constraints
66%	*d. 	Run at different rates in different proteins

42.	 Frogs versus mammals is an example
25%	a.	of very different rates of molecular evolution  
20%	b. 	of similar rates of morphological evolution
51%	*c. 	showing rates of molecular and morphological evolution are 
		uncoupled
4%	d. 	that proves the neutral theory 

43.	 Epsilon-crystallin
7%	a.	Is an example of an important bacterial gene 
80%	*b. 	Illustrates the important of regulatory changes
11%	c. 	Is the basis of microspheres
2%	d. 	Is the mathematical term for the rate of neutral molecular 
		evolution	 
  
44.	 Under the neutral theory, if the neutral mutation rate is the same
22%	a.	A small population shows more genetic variation than a large 
		one
41%	*b. 	A large population shows more genetic variation than a small 
		one
17%	c. 	Both small and large populations show the same genetic 
			variation
20%	d. 	Population size has no bearing on that amount of genetic 
		variation found within a population.

45.	A neutral mutant
0%	a.	Is always fixed in a small population  
20%       b. 	Is much more common than a mutant  under selection
20%     *c. 	Has no effect on fitness
60%	d. 	All of the above	 
  
46.	 The first fossil evidence for life
8%	a.	Is at 4.5 billion years ago
37% 	b. 	Is in the form of stromatolites
51%	*c. 	Is in the form of microfossils
4%	d. 	Shows evidence of aerobic respiration

47.	 The carbon in our DNA comes from
60%	*a.	The remains of dead stars
20%	b. 	The original big-bang
20%	c.	Microspheres
0%   	d. 	Fossil stromatolites

48.	 The Miller-Urey experiment showed
6%	a.	Microspheres spontaneously form 
3%	b. 	Sickle cell anemia homozygotes are resistant to malaria
85%	*c. 	The conditions on the early earth generate complex organic 
		molecules
6%	d.	That life formed in a primeval soup

49.	  Catalytic RNAs
13%	a.	Were discovered by Cech	 
2%	b. 	Allow the first cells to have RNA genomes 
1%	c. 	Allow the first organisms to have little or no proteins
83%	*d. 	All of the above
	 
50.	The first cells
22%	a.	Appeared at least 4 billion years ago	 
2%	b. 	Used oxygen
 1% 	c. 	Use aerobic respiration
66% 	*d.	None of the above