QUESTION 18 If we follow a population through time and observe that allele frequ
ID: 39189 • Letter: Q
Question
QUESTION 18
If we follow a population through time and observe that allele frequencies change or genotypic frequencies change in this population, we can conclude:
the population size is small.
selection is operating on the locus.
mating is non-random.
Any of the above.
All of the above.
QUESTION 20
At an underdominant locus, how will allele frequencies change through time?
The homozygote with the greatest fitness advantage will have its allele fixed.
A balanced polymorphism of both alleles will be maintained at a stable equilibrium.
The homozygote with the lowest fitness advantage will have its allele lost.
One or the other allele will be lost depending on their initial frequencies.
Both alleles will be lost.
QUESTION 22
Allele frequencies change at ______ rate under mutation versus selection.
the same
a faster
a slower
a constant
None of the above
2 points
QUESTION 23
Consider a locus in which the fitness of AA and Aa genotypes are greater than the fitness of aa genotype. In addition, this locus experiences forward mutation from the A allele to a allele. At this locus, the A allele:
will always go to fixation.
will always be lost.
will never go to fixation.
will never change.
None of the above.
2 points
QUESTION 24
Inbreeding depression is caused by:
a reduction in fitness caused by deleterious recessives
random mating
mutation-selection balance.
A and B.
All of the above.
a.the population size is small.
b.selection is operating on the locus.
c.mating is non-random.
d.Any of the above.
e.All of the above.
QUESTION 20
At an underdominant locus, how will allele frequencies change through time?
a.The homozygote with the greatest fitness advantage will have its allele fixed.
b.A balanced polymorphism of both alleles will be maintained at a stable equilibrium.
c.The homozygote with the lowest fitness advantage will have its allele lost.
d.One or the other allele will be lost depending on their initial frequencies.
e.Both alleles will be lost.
QUESTION 22
Allele frequencies change at ______ rate under mutation versus selection.
a.the same
b.a faster
c.a slower
d.a constant
e.None of the above
2 points
QUESTION 23
Consider a locus in which the fitness of AA and Aa genotypes are greater than the fitness of aa genotype. In addition, this locus experiences forward mutation from the A allele to a allele. At this locus, the A allele:
a.will always go to fixation.
b.will always be lost.
c.will never go to fixation.
d.will never change.
e.None of the above.
2 points
QUESTION 24
Inbreeding depression is caused by:
a.a reduction in fitness caused by deleterious recessives
b.random mating
c.mutation-selection balance.
d.A and B.
e.All of the above.
Explanation / Answer
18.a
20. d
22. a
23. b
24. e