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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

4.1.6 Hardy-Weinberg Equation – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Which is NOT a condition of Hardy–Weinberg equilibrium?
Large population
Strong natural selection
Random mating
No migration
2.
Which statement best describes Hardy–Weinberg principle?
A group of organisms of the same species living in the same place at the same time and able to interbreed.
An environmental factor that affects the survival and reproductive success of individuals with particular phenotypes.
A model predicting that allele and genotype frequencies stay constant between generations if certain conditions are met.
All the alleles of all the genes present in a population at a given time.
3.

The Hardy–Weinberg equation can be used to

see whether allele frequencies in a population are changing over time
count species
measure habitat area
classify organisms
4.

The Hardy–Weinberg equation is

p² + 2pq + q² = 1
p + q = 2
p² + q² = 1
2pq = 1
5.
The Hardy-Weinberg principle describes a population in which
mutation rates are high
natural selection is strong
allele frequencies stay constant from generation to generation
migration is frequent
6.
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
7.
Why can Hardy-Weinberg equilibrium occur only in large populations?
Why can Hardy-Weinberg equilibrium occur only in large populations?
Large populations are likely to have more variable environments.
More individuals means less chance for natural selection to occur.
Genetic drift is a much stronger force in small versus large populations.
Large populations make random mating virtually impossible.
Large populations tend to last longer than small ones.
8.
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
9.
Nine percent of an anteater population has a short snout (recessive). At Hardy-Weinberg equilibrium, what is the expected percent heterozygous?
Nine percent of an anteater population has a short snout (recessive). At Hardy-Weinberg equilibrium, what is the expected percent heterozygous?
26.0
30.0
34.0
38.0
42.0
10.
In a squirrel population at Hardy-Weinberg equilibrium, black (recessive) is 9 percent. What percentage is homozygous dominant?
In a squirrel population at Hardy-Weinberg equilibrium, black (recessive) is 9 percent. What percentage is homozygous dominant?
21 percent
30 percent
49 percent
70 percent
11.
Which condition is required to keep the squirrel population of the previous question in Hardy-Weinberg equilibrium?
Which condition is required to keep the squirrel population of the previous question in Hardy-Weinberg equilibrium?
Random mating
Genetic drift
Mutation
Gene flow
12.
What would be the approximate frequency of the heterozygote if this population were in Hardy-Weinberg equilibrium? (see the figure)
What would be the approximate frequency of the heterozygote if this population were in Hardy-Weinberg equilibrium? (see the figure)
20 percent
45 percent
48 percent
72 percent
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Part of Topic 4 · Biodiversity and Natural Resources — see every lesson and quiz in this unit.
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