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Course: AQA A Level Biology 7402
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AQA A Level Biology 7402

1. Biological Molecules

0/102

2. Cell Structure

0/95

3. Exchange and Transport

0/98

4. Genetics, Variation and Interdependence

0/94

5. Energy Transfers In and Between Organisms (A Level only)

0/63

6. Organisms Respond to Changes in their Environments (A Level only)

0/93

7. Genetics, Populations, Evolution and Ecosystems (A Level only)

0/55

8. The Control of Gene Expression (A Level only)

0/72

9. Exam Guidance and Skills

0/38
Quiz

7.3.5 Investigating Allele Frequencies – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
In a population at Hardy-Weinberg equilibrium, the frequency of the recessive allele is 0.3. The frequency of homozygous recessive individuals is
0.49
0.42
0.09
0.3
2.
A population of frogs is 9 percent speckled (recessive) and 91 percent without speckles. What are the frequencies of the p and q alleles at Hardy-Weinberg equilibrium?
A population of frogs is 9 percent speckled (recessive) and 91 percent without speckles. What are the frequencies of the p and q alleles at Hardy-Weinberg equilibrium?
p = 0.49, q = 0.51
p = 0.60, q = 0.40
p = 0.70, q = 0.30
p = 0.49, q = 0.30
p = 0.49, q = 0.09
3.
Which process may be occurring in this population, given the allele frequencies? (see the figure)
Which process may be occurring in this population, given the allele frequencies? (see the figure)
Directional selection
Homozygous advantage
Hybrid vigor
Allopatric speciation
4.
Which statement best describes Allele frequency?
How common an allele is in the gene pool, as a proportion.
A physical barrier separating two parts of a population.
A few individuals starting a new population that is unrepresentative of the original.
The formation of a new species from an existing one.
5.
A population of 500 has 700 A alleles and 300 a alleles. What is the frequency of allele a?
0.7
0.3
0.6
300
6.
Allele frequencies in a population over generations are shown. Has evolution occurred?
No — the population size stayed the same
No — individuals did not change
Only if new species formed
Yes — allele frequencies have changed
7.
Allele frequencies in a large and a small population are shown over time. Which process explains the small population's wild changes?
Natural selection only
Genetic drift, which is strongest in small populations
Gene flow
Stabilising selection
8.
Using the pie chart, what is the frequency of allele r?
Dr Dabour Hub Academy - figure 1
0.64
36
0.36
0.5
9.
The frequency of homozygous recessive individuals is 0.25. The recessive allele frequency is:
0.5
0.25
0.0625
0.75
10.
A few birds colonize a remote island and the new population has allele frequencies unlike the mainland. This is:
gene flow
stabilizing selection
sexual selection
the founder effect
11.
A small group colonises an island and has different allele frequencies from the mainland. This is:
Gene flow
Bottleneck effect
Founder effect
Sexual selection
12.
Random change in allele frequency is called _____.
genetic drift
speciation
natural selection
gene flow
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Part of 7. Genetics, Populations, Evolution and Ecosystems (A Level only) — see every lesson and quiz in this unit.
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