EVOLUTION MIDTERM PRACTICE QUESTIONS & CORRECT ANSWERS
1. What is the likelihood of fixation due to drift of
D. 1/(2N)
a new mutation in a population of diploid
individuals? N is population size.
A. 1 - N
B. 1 - 1/(2N)
C. 1/N
D. 1/(2N)
E. 2N
2. Choose the population size in which a new very
slight- A. 10 ly deleterious allele is most likely to
increase in fre- quency.
A. 10
B. 50
C. 100
D. 200
E. 1000
3. What is the fate of common advantageous alleles in a C. Increases
in frequency
large population? and eventually
A. Lost because of drift becomes fixed
B.Remain at intermediate frequency in the
population for a long period of time
C. Increases in frequency and eventually
becomes fixed
D. Lost by mutation
E. All of the above
4. What is the fate of deleterious alleles in a large popu- B. Removed
from the pop-
lation? A. Lost because
of drift
,EVOLUTION MIDTERM PRACTICE QUESTIONS & CORRECT ANSWERS
B. Removed from the population by ulation by selection
selection
,EVOLUTION MIDTERM PRACTICE QUESTIONS & CORRECT ANSWERS
C. Increases in frequency and eventually
becomes fixed
5. If an allele has a frequency of 0.5, what is its expected B. 0.5
frequency in the next generation if its fate is
governed by drift?
A. less than 0.5
B. 0.5
C. greater than 0.5
D. All of the above depending on population size
6. What does each line of this code do? line 1: creates a scatter-
plot
plot(x,y)
line 2: naming an
mod <- lm (x~y)
object mod, where lm
abline(mod)
is the fit- ting of the
linear model to the
Which line is incorrect, and why?
data
line 3:adds a regression
line to the points
Incorrect:The second
line is incorrect,
because it should be
(y~x) because it is
supposed to be y in
terms of x, not x in
7. If you started with 50 populations and each
terms of y
one had an equal frequency of two neutral
alleles (say A and B) 25 populations
would have only the A
allele
, EVOLUTION MIDTERM PRACTICE QUESTIONS & CORRECT ANSWERS
B) at the beginning of an experiment and you allowed and 25
populations would
each population to evolve by genetic drift have only the B allele
such that change happened rapidly (i.e. the
size of each popu- lation is small), how many
populations would be ex-
1. What is the likelihood of fixation due to drift of
D. 1/(2N)
a new mutation in a population of diploid
individuals? N is population size.
A. 1 - N
B. 1 - 1/(2N)
C. 1/N
D. 1/(2N)
E. 2N
2. Choose the population size in which a new very
slight- A. 10 ly deleterious allele is most likely to
increase in fre- quency.
A. 10
B. 50
C. 100
D. 200
E. 1000
3. What is the fate of common advantageous alleles in a C. Increases
in frequency
large population? and eventually
A. Lost because of drift becomes fixed
B.Remain at intermediate frequency in the
population for a long period of time
C. Increases in frequency and eventually
becomes fixed
D. Lost by mutation
E. All of the above
4. What is the fate of deleterious alleles in a large popu- B. Removed
from the pop-
lation? A. Lost because
of drift
,EVOLUTION MIDTERM PRACTICE QUESTIONS & CORRECT ANSWERS
B. Removed from the population by ulation by selection
selection
,EVOLUTION MIDTERM PRACTICE QUESTIONS & CORRECT ANSWERS
C. Increases in frequency and eventually
becomes fixed
5. If an allele has a frequency of 0.5, what is its expected B. 0.5
frequency in the next generation if its fate is
governed by drift?
A. less than 0.5
B. 0.5
C. greater than 0.5
D. All of the above depending on population size
6. What does each line of this code do? line 1: creates a scatter-
plot
plot(x,y)
line 2: naming an
mod <- lm (x~y)
object mod, where lm
abline(mod)
is the fit- ting of the
linear model to the
Which line is incorrect, and why?
data
line 3:adds a regression
line to the points
Incorrect:The second
line is incorrect,
because it should be
(y~x) because it is
supposed to be y in
terms of x, not x in
7. If you started with 50 populations and each
terms of y
one had an equal frequency of two neutral
alleles (say A and B) 25 populations
would have only the A
allele
, EVOLUTION MIDTERM PRACTICE QUESTIONS & CORRECT ANSWERS
B) at the beginning of an experiment and you allowed and 25
populations would
each population to evolve by genetic drift have only the B allele
such that change happened rapidly (i.e. the
size of each popu- lation is small), how many
populations would be ex-
