BIO 322- EXAM 2
BIO 322- EXAM 2 PRACTICE QUESTIONS AND ANSWERS GRADED A+
If selection is only strong enough to overcome the random effects of genetic drift
when Ne s >> 1, how large a selection coefficient s is needed for a beneficial new
mutation to reliably evolve to higher frequency in a typical human population? -
correct answer Ne in human population: 10,000
|s| > 1/Ne
|s| > 1/10,000
|s| > 0.0001
A selection coefficient of 0.0001 would be needed.
Consider the following descriptions of genetic loci, and predict what dN/dS ratio
you would expect to see for each one in a comparison between a human and a
mouse. - correct answer A gene coding for one of the subunits of a ribosome. dN/dS
<1
A noncoding region of DNA.
dN/dS = 0
, BIO 322- EXAM 2
A gene coding for a protein involved in color vision.
dN/dS > 1
A gene coding for a protein involved in olfactory (smell) sensitivity.
dN/dS > 1
A gene coding for a protein involved in cellular respiration.
dN/dS < 1
Rank the following species in terms of the effective population size you might
expect them to have. - correct answer -Elephants, which have few very large
offspring.
Smaller effective population size
-Mice, which have many offspring.
Larger effective population size
-Social bees, who live in hives in which only a few individuals reproduce.
Smaller effective population size
-Pine trees, which mate via wind-dispersed pollen that can reach hundreds of
other trees.
Larger effective population size
BIO 322- EXAM 2 PRACTICE QUESTIONS AND ANSWERS GRADED A+
If selection is only strong enough to overcome the random effects of genetic drift
when Ne s >> 1, how large a selection coefficient s is needed for a beneficial new
mutation to reliably evolve to higher frequency in a typical human population? -
correct answer Ne in human population: 10,000
|s| > 1/Ne
|s| > 1/10,000
|s| > 0.0001
A selection coefficient of 0.0001 would be needed.
Consider the following descriptions of genetic loci, and predict what dN/dS ratio
you would expect to see for each one in a comparison between a human and a
mouse. - correct answer A gene coding for one of the subunits of a ribosome. dN/dS
<1
A noncoding region of DNA.
dN/dS = 0
, BIO 322- EXAM 2
A gene coding for a protein involved in color vision.
dN/dS > 1
A gene coding for a protein involved in olfactory (smell) sensitivity.
dN/dS > 1
A gene coding for a protein involved in cellular respiration.
dN/dS < 1
Rank the following species in terms of the effective population size you might
expect them to have. - correct answer -Elephants, which have few very large
offspring.
Smaller effective population size
-Mice, which have many offspring.
Larger effective population size
-Social bees, who live in hives in which only a few individuals reproduce.
Smaller effective population size
-Pine trees, which mate via wind-dispersed pollen that can reach hundreds of
other trees.
Larger effective population size
