Question: QUESTION 1
Consider a population of the jumping spider Marpissa
muscosa. It is polymorphic for a …
QUESTION 1
Consider a population of the jumping spider Marpissa
muscosa. It is polymorphic for a 5 base-pair microsatellite.
Alleles with 7 and 4 copies are denoted by + and –,
respectively.
We found the following genotype counts in a sample of 47
individuals:
| Genotype |
Count |
| +/+ |
26 |
| +/– |
15 |
| –/– |
6 |
What would be expected number of +/+ homozygotes if the
population was in Hardy-Weinberg equilibrium and had the same
allele frequencies as the actual sample?
|
|
14
|
|
|
16
|
|
|
18
|
|
|
20
|
|
|
22
|
|
|
24
|
|
|
26
|
|
|
28
|
|
|
30
QUESTION 2
What is the value of the  statistic testing whether the
population shows the genotype counts predicted under the hypothesis
of Hardy-Weinberg equilibrium?
|
|
0.3
|
|
|
1.3
|
|
|
2.3
|
|
|
3.3
|
|
|
4.3
|
|
|
5.3
|
|
|
6.3
|
|
|
7.3
QUESTION 1
Consider a population of the jumping spider Marpissa
muscosa. It is polymorphic for a 5 base-pair microsatellite.
Alleles with 7 and 4 copies are denoted by + and –,
respectively.
We found the following genotype counts in a sample of 47
individuals:
| Genotype |
Count |
| +/+ |
26 |
| +/– |
15 |
| –/– |
6 |
What would be expected number of +/+ homozygotes if the
population was in Hardy-Weinberg equilibrium and had the same
allele frequencies as the actual sample?
|
|
14
|
|
|
16
|
|
|
18
|
|
|
20
|
|
|
22
|
|
|
24
|
|
|
26
|
|
|
28
|
|
|
30
|
0.5 points
QUESTION 2
What is the value of the statistic testing whether the
population shows the genotype counts predicted under the hypothesis
of Hardy-Weinberg equilibrium?
|
|
0.3
|
|
|
1.3
|
|
|
2.3
|
|
|
3.3
|
|
|
4.3
|
|
|
5.3
|
|
|
6.3
|
|
|
7.3
|
0.5 points
QUESTION 3
What do you conclude about the population?
Note: the critical value of the statistic at the 5% significance
level is 3.84.
|
|
< 3.84, so the population
does not deviate significantly (P > 0.05) from the
prediction of Hardy-Weinberg equilibrium. Therefore, the population
must satisfy one or more of the assumptions of Hardy-Weinberg
equilibrium.
|
|
|
< 3.84, so the population
does not deviate significantly (P > 0.05) from the
prediction of Hardy-Weinberg equilibrium. Therefore, the population
must violate one or more of the assumptions of Hardy-Weinberg
equilibrium.
|
|
|
< 3.84, so the population
does not deviate significantly (P > 0.05) from the
prediction of Hardy-Weinberg equilibrium. Therefore, we cannot
conclude anything about whether the population does or does not
satisfy any of the assumptions of Hardy-Weinberg equilibrium.
|
|
|
> 3.84, so the population
deviates significantly (P < 0.05) from the prediction
of Hardy-Weinberg equilibrium. Therefore, the population must
satisfy one or more of the assumptions of Hardy-Weinberg
equilibrium.
|
|
|
> 3.84, so the population
deviates significantly (P < 0.05) from the prediction
of Hardy-Weinberg equilibrium. Therefore, the population must
violate one or more of the assumptions of Hardy-Weinberg
equilibrium.
|
|
|
> 3.84, so the population
deviates significantly (P < 0.05) from the prediction
of Hardy-Weinberg equilibrium. Therefore, we cannot conclude
anything about whether the population does or does not satisfy any
of the assumptions of Hardy-Weinberg equilibrium.
QUESTION 4
Which of the following is an assumption of Hardy-Weinberg
equilibrium?
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|
Every individual in the population always mates with an
individual with a different genotype.
|
|
|
Genotypes cannot mutate into other genotypes.
|
|
|
Some individuals in the population have a higher probability of
surviving and reproducing than others.
|
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The total number of individuals (population size) changes from
generation to generation.
|
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|
Grandparents, parents, and offspring can all be alive at the
same time.
|
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|
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