Biology 1M03 Final Exam
Practice QUESTIONS AND
VERIFIED CORRECT
ANSWERS GRADED A+
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Which is true about Balancing selection
a) Favours one extreme phenotype
b)Genetic Variation is reduced
c)Genetic variation is maintained
d)None of the above - CORRECT ANSWER-c)
Which type of natural selection increases the frequency of one extreme phenotype? - CORRECT
ANSWER-Directional Selection
Human babies of average size are most likely to survive
,Which type of natural selection does this represent? - CORRECT ANSWER-Stabilizing Selection
Which is false about genetic drift
a)Causes genetic variation to decrease
b)More pronounced in small populations
c) Biased with respect to fitness
d)Over time can lead to random loss or fixation of alleles - CORRECT ANSWER-c)
Explanation: Unbiased w.r.t. fitness
Which is true about genetic drift, founder effects and bottlenecks
a) Increase in number of alleles and an (maybe) increase in frequency
b)Increase in number of alleles and (maybe) decrease in frequency
c) Decrease in number of alleles and (maybe) increase in frequency
d) Decrease in number of alleles and (maybe) decrease in frequency - CORRECT ANSWER-c)
True or False: Biased mating (inbreeding or sexual selection) violates H-W equilibrium. -
CORRECT ANSWER-True
Inbreeding depression is best described as...
a) Decline in average fitness when homozygosity decreases and heterozygosity increases
b) Decline in average fitness when homozygosity increases and heterozygosity decrease
c) Decline in average fitness when homozygosity and heterozygosity are equal
d)Incline in average fitness - CORRECT ANSWER-b)
How does Mutation effect genetic variation and average fitness
, a) increases genetic variation, random w.r.t. fitness
b) increases genetic variation, decreases w.r.t. fitness
c)decrease genetic variation, increase w.r.t fitness
d) decreases genetic variation, decreases w.r.t. fitness - CORRECT ANSWER-a), possibly b)- most
alleles lower fitness
Explanation : Mutation produces more alleles, these alleles can be advantageous to fitness or be
disadvantageous
What are the consequences of Sexual Selection?
a) Fundamental Asymmetry of Sex
b)H-W equilibrium
c)Sexual dimorphism
d) Sexual conflict
e) b and c
f) c and d - CORRECT ANSWER-f) c and d
What happens to a species if gene flow stops - CORRECT ANSWER-Natural selection, genetic
drift and mutation begin to act on the population independently
Which describes the Biological Species Concept
a) Species are distinguished by differences in size, shape or other morphological features
b) based on reconstructing evolutionary history of populations
c)Assigns individuals to the same species if they "actually or potentially interbreed" - CORRECT
ANSWER-c)
What is the problem with the phylogenetic species concept
a) may end up over diagnosing species
Practice QUESTIONS AND
VERIFIED CORRECT
ANSWERS GRADED A+
LATEST 100% GUARANTEED
PASS
Which is true about Balancing selection
a) Favours one extreme phenotype
b)Genetic Variation is reduced
c)Genetic variation is maintained
d)None of the above - CORRECT ANSWER-c)
Which type of natural selection increases the frequency of one extreme phenotype? - CORRECT
ANSWER-Directional Selection
Human babies of average size are most likely to survive
,Which type of natural selection does this represent? - CORRECT ANSWER-Stabilizing Selection
Which is false about genetic drift
a)Causes genetic variation to decrease
b)More pronounced in small populations
c) Biased with respect to fitness
d)Over time can lead to random loss or fixation of alleles - CORRECT ANSWER-c)
Explanation: Unbiased w.r.t. fitness
Which is true about genetic drift, founder effects and bottlenecks
a) Increase in number of alleles and an (maybe) increase in frequency
b)Increase in number of alleles and (maybe) decrease in frequency
c) Decrease in number of alleles and (maybe) increase in frequency
d) Decrease in number of alleles and (maybe) decrease in frequency - CORRECT ANSWER-c)
True or False: Biased mating (inbreeding or sexual selection) violates H-W equilibrium. -
CORRECT ANSWER-True
Inbreeding depression is best described as...
a) Decline in average fitness when homozygosity decreases and heterozygosity increases
b) Decline in average fitness when homozygosity increases and heterozygosity decrease
c) Decline in average fitness when homozygosity and heterozygosity are equal
d)Incline in average fitness - CORRECT ANSWER-b)
How does Mutation effect genetic variation and average fitness
, a) increases genetic variation, random w.r.t. fitness
b) increases genetic variation, decreases w.r.t. fitness
c)decrease genetic variation, increase w.r.t fitness
d) decreases genetic variation, decreases w.r.t. fitness - CORRECT ANSWER-a), possibly b)- most
alleles lower fitness
Explanation : Mutation produces more alleles, these alleles can be advantageous to fitness or be
disadvantageous
What are the consequences of Sexual Selection?
a) Fundamental Asymmetry of Sex
b)H-W equilibrium
c)Sexual dimorphism
d) Sexual conflict
e) b and c
f) c and d - CORRECT ANSWER-f) c and d
What happens to a species if gene flow stops - CORRECT ANSWER-Natural selection, genetic
drift and mutation begin to act on the population independently
Which describes the Biological Species Concept
a) Species are distinguished by differences in size, shape or other morphological features
b) based on reconstructing evolutionary history of populations
c)Assigns individuals to the same species if they "actually or potentially interbreed" - CORRECT
ANSWER-c)
What is the problem with the phylogenetic species concept
a) may end up over diagnosing species
