BI358 PSU Evolution Exam II Questions With Complete
Solutions
A feasible and effective way to accelerate the reduction in D in a
population would be...
1. Increase gene flow.
2. Increase selection.
3. Increase outbreeding.
4. Only 1 and 2 are true.
5. Only 1 and 3 are true.
6. Only 2 and 3 are true.
7. All 1, 2, and 3 are true. Correct Answers 3. Increase
outbreeding
Conditions necessary to detect recent gene flow among
populations using gametic disequilibrium:
1. Weak linkage
2. Gene flow must have been within the last few generations
3. Populations must differ in allele frequencies
4. Both 1 and 2 must be true
5. Both 1 and 3 must be true
6. Both 2 and 3 must be true
7. All, 1, 2, and 3 must be true Correct Answers 6. Both 2 and 3
must be true
Crossing over during meiosis results in....
1. Linkage.
2. Recombination.
,3. Increase in gametic disequilibria.
4. Only 1 and 2 are true.
5. Only 1 and 3 are true.
6. Only 2 and 3 are true.
7. All 1, 2, and 3 are true. Correct Answers 2. Recombination
Detrimental (s>0) recessive alleles (h=0) are generally
maintained in populations because...
1. When the allele frequency is close to zero the majority of
detrimental alleles will be in heterozygous A1A2 genotypes.
2. The detrimental allele is hidden from the effect of selection in
the A1A2 genotypes.
3. Selection becomes weaker as allele frequency approaches
zero.
4. Both 1 and 2 are true.
5. Both 2 and 3 are true.
6. Both 1 and 3 are true.
7. All, 1, 2, and 3 are true. Correct Answers 4. Both 1 and 2 are
true
For a deleterious allele A2, if h = 0.5 when is Δq maximized?
1. When q = 0.5
2. When q is close to 1.0
3. When q is close to 0.0
4. Both 1 and 2 are true.
5. Both 2 and 3 are true.
6. Both 1 and 3 are true.
7. All, 1, 2, and 3. Correct Answers 1. When q = 0.5
, For a deleterious recessive (h=0) allele at frequency q, when
would you expect Δq to be the lowest?
When q > 0.5 and q < 1.0
When q is close to 1.0
When q = 0.5
When q < 0.5 and q > 0.0
When q is close to 0.0
Δq is not affected by q Correct Answers When q is close to 0.0
For an allele under selection the effects of inbreeding will be...
1. Inbreeding will expose more deleterious recessive alleles to
the effects of selection.
2. Inbreeding will accelerate the fixation of advantageous
recessive alleles.
3. Inbreeding will lead to purging of genetic load if it is
primarily due to overdominance.
4. Only 1 and 2 are true.
5. Only 1 and 3 are true.
6. Only 2 and 3 are true.
7. All 1, 2, and 3 are true. Correct Answers 4. Only 1 and 2 are
true
For an unlinked pair of alleles, the gametic disequilibrium is
reduced by ½ each generation because....
1. Repulsion phase allele combinations are converted to
coupling phase.
2. Coupling phase allele combinations are converted to repulsion
phase.
Solutions
A feasible and effective way to accelerate the reduction in D in a
population would be...
1. Increase gene flow.
2. Increase selection.
3. Increase outbreeding.
4. Only 1 and 2 are true.
5. Only 1 and 3 are true.
6. Only 2 and 3 are true.
7. All 1, 2, and 3 are true. Correct Answers 3. Increase
outbreeding
Conditions necessary to detect recent gene flow among
populations using gametic disequilibrium:
1. Weak linkage
2. Gene flow must have been within the last few generations
3. Populations must differ in allele frequencies
4. Both 1 and 2 must be true
5. Both 1 and 3 must be true
6. Both 2 and 3 must be true
7. All, 1, 2, and 3 must be true Correct Answers 6. Both 2 and 3
must be true
Crossing over during meiosis results in....
1. Linkage.
2. Recombination.
,3. Increase in gametic disequilibria.
4. Only 1 and 2 are true.
5. Only 1 and 3 are true.
6. Only 2 and 3 are true.
7. All 1, 2, and 3 are true. Correct Answers 2. Recombination
Detrimental (s>0) recessive alleles (h=0) are generally
maintained in populations because...
1. When the allele frequency is close to zero the majority of
detrimental alleles will be in heterozygous A1A2 genotypes.
2. The detrimental allele is hidden from the effect of selection in
the A1A2 genotypes.
3. Selection becomes weaker as allele frequency approaches
zero.
4. Both 1 and 2 are true.
5. Both 2 and 3 are true.
6. Both 1 and 3 are true.
7. All, 1, 2, and 3 are true. Correct Answers 4. Both 1 and 2 are
true
For a deleterious allele A2, if h = 0.5 when is Δq maximized?
1. When q = 0.5
2. When q is close to 1.0
3. When q is close to 0.0
4. Both 1 and 2 are true.
5. Both 2 and 3 are true.
6. Both 1 and 3 are true.
7. All, 1, 2, and 3. Correct Answers 1. When q = 0.5
, For a deleterious recessive (h=0) allele at frequency q, when
would you expect Δq to be the lowest?
When q > 0.5 and q < 1.0
When q is close to 1.0
When q = 0.5
When q < 0.5 and q > 0.0
When q is close to 0.0
Δq is not affected by q Correct Answers When q is close to 0.0
For an allele under selection the effects of inbreeding will be...
1. Inbreeding will expose more deleterious recessive alleles to
the effects of selection.
2. Inbreeding will accelerate the fixation of advantageous
recessive alleles.
3. Inbreeding will lead to purging of genetic load if it is
primarily due to overdominance.
4. Only 1 and 2 are true.
5. Only 1 and 3 are true.
6. Only 2 and 3 are true.
7. All 1, 2, and 3 are true. Correct Answers 4. Only 1 and 2 are
true
For an unlinked pair of alleles, the gametic disequilibrium is
reduced by ½ each generation because....
1. Repulsion phase allele combinations are converted to
coupling phase.
2. Coupling phase allele combinations are converted to repulsion
phase.
