Hardy-Weinberg Principle Practice Questions
20 free Hardy-Weinberg Principle practice questions for the Zoology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
What does the Hardy-Weinberg principle describe?
- A Genetic equilibrium in a population
- B Evolution of species over many generations
- C Mutation rate within a population
- D Speciation process among populations
Correct answer: Genetic equilibrium in a population
The Hardy-Weinberg principle describes a state where allele and genotype frequencies remain constant across generations. This occurs when no evolutionary forces act on the population.
Which equation represents Hardy-Weinberg equilibrium?
- A p^2+2pq+q^2=1
- B p+q=1
- C p^2-2pq+q^2=1
- D 2p+2q=1
Correct answer: p^2+2pq+q^2=1
The equation p^2 + 2pq + q^2 = 1 represents genotype frequencies in a population at equilibrium. It is derived from allele frequencies p and q.
What does 'p' represent in Hardy-Weinberg equilibrium?
- A Frequency of dominant allele
- B Frequency of recessive allele
- C Mutation rate
- D Population size
Correct answer: Frequency of dominant allele
In Hardy-Weinberg equilibrium, 'p' represents the frequency of the dominant allele. It is used along with 'q' to calculate genotype frequencies.
What does '2pq' represent in the Hardy-Weinberg equation?
- A Frequency of homozygous dominant
- B Frequency of heterozygotes
- C Frequency of homozygous recessive
- D Mutation rate
Correct answer: Frequency of heterozygotes
The term 2pq represents the frequency of heterozygous individuals in a population. It depends on both allele frequencies p and q.
Which condition is required for Hardy-Weinberg equilibrium?
- A Small population size
- B Non-random mating
- C Absence of mutation
- D Natural selection
Correct answer: Absence of mutation
Hardy-Weinberg equilibrium requires no mutation to maintain stable allele frequencies. Mutations introduce new alleles and disrupt equilibrium.
Which factor disrupts Hardy-Weinberg equilibrium by favoring certain traits?
- A Random genetic drift
- B Gene flow
- C Natural selection
- D Random mating
Correct answer: Natural selection
Natural selection favors individuals with advantageous traits. This changes allele frequencies over time, violating equilibrium conditions.
What happens to allele frequencies in a population at Hardy-Weinberg equilibrium?
- A They increase
- B They decrease
- C They remain constant
- D They fluctuate randomly
Correct answer: They remain constant
Allele frequencies remain constant across generations in Hardy-Weinberg equilibrium. This indicates no evolutionary forces are acting.
Which assumption is violated when individuals choose mates based on traits?
- A No mutation
- B Random mating
- C Large population
- D No migration
Correct answer: Random mating
Non-random mating violates the assumption of random mating. It can alter genotype frequencies in the population.
Which evolutionary force causes random changes in allele frequencies?
- A Natural selection
- B Mutation
- C Genetic drift
- D Gene flow
Correct answer: Genetic drift
Genetic drift causes random fluctuations in allele frequencies, especially in small populations. It is not based on fitness.
Which factor introduces new alleles into a population?
- A Selection
- B Mutations
- C Genetic drift
- D Inbreeding
Correct answer: Mutations
Mutation creates new alleles by altering DNA sequences. It is a primary source of genetic variation.
Which process involves movement of alleles between populations?
- A Mutation
- B Gene flow
- C Genetic drift
- D Selection
Correct answer: Gene flow
Gene flow involves migration of individuals or gametes between populations. It alters allele frequencies by introducing new genetic material.
If q = 0.3, what is the value of p?
- A 0.3
- B 0.5
- C 0.7
- D 1.3
Correct answer: 0.7
In Hardy-Weinberg equilibrium, p + q = 1. If q = 0.3, then p = 1 - 0.3 = 0.7.
Which genotype frequency is represented by p^2?
- A Heterozygous
- B Homozygous dominant
- C Homozygous recessive
- D Mutant genotype
Correct answer: Homozygous dominant
p^2 represents the frequency of homozygous dominant individuals. It is calculated using the frequency of the dominant allele.
Which factor is minimized in large populations under Hardy-Weinberg equilibrium?
- A Genetic mutation
- B Selection
- C Genetic drift
- D Gene flow
Correct answer: Genetic drift
Genetic drift has less effect in large populations because random fluctuations are less significant. Large size is a key assumption of equilibrium.
Which condition ensures no change in allele frequency due to migration?
- A No mutation
- B Random mating
- C Large population
- D No gene flow
Correct answer: No gene flow
No gene flow ensures that no new alleles enter or leave the population. This maintains stable allele frequencies.
What is the main use of the Hardy-Weinberg principle?
- A Predict future mutation rates
- B Estimate genotype frequencies
- C Study ancient fossil records
- D Analyze ecosystem dynamics
Correct answer: Estimate genotype frequencies
The Hardy-Weinberg principle is used to estimate genotype frequencies from allele frequencies. It helps detect evolutionary changes.
Which factor increases homozygosity in a population?
- A Outbreeding
- B Random mating
- C Mutation
- D Inbreeding
Correct answer: Inbreeding
Inbreeding increases the likelihood of individuals inheriting identical alleles. This leads to higher homozygosity.
Which assumption is violated when a population is very small?
- A Random mating
- B Absence of mutation
- C No selection pressure
- D Large population size
Correct answer: Large population size
Hardy-Weinberg equilibrium assumes a large population size. Small populations are more affected by genetic drift.
Which of the following represents allele frequencies in a population?
- A p^2 and q^2
- B 2pq and q^2
- C p^2 and 2pq
- D p, q values
Correct answer: p, q values
Allele frequencies are represented by p and q. These values are used to calculate genotype frequencies.
Which factor can cause rapid evolutionary change in allele frequencies?
- A Random mating
- B No mutation
- C Large populations
- D Natural selection
Correct answer: Natural selection
Natural selection can rapidly change allele frequencies by favoring beneficial traits. It is a key mechanism of evolution.