Biology

Genetics and Evolutionary Biology

1,156 Questions

Genetics and evolutionary biology explain how traits are passed from parents to offspring and how species change over time. Key concepts include genetic drift, inbreeding, and heredity. This topic is fundamental for the biology section of many competitive tests.

Heredity and traitsGenetic variations and driftInbreeding conceptsEvolutionary mechanisms

Genetics and Evolutionary Biology Questions

Multiple choice

What is the primary source of genetic variation in a population?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Natural selection
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mutation is the ultimate source of genetic variation, introducing new alleles into a population.

Multiple choice

What is the process by which genetic variation is passed from parents to offspring?

  1. Mitosis

  2. Meiosis

  3. Fertilization

  4. Gene flow
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Meiosis is the process by which genetic variation is passed from parents to offspring. During meiosis, homologous chromosomes pair up and exchange genetic material through a process called crossing over. This results in the production of gametes (eggs and sperm) that contain a unique combination of alleles.

Multiple choice

What is the term for the movement of alleles between populations?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Natural selection
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gene flow is the movement of alleles between populations. This can occur through migration, mating, or the dispersal of seeds or pollen.

Multiple choice

What is the process by which natural selection acts on genetic variation to produce adaptations?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Natural selection
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Natural selection is the process by which natural selection acts on genetic variation to produce adaptations. Natural selection favors individuals with traits that are better suited to their environment, allowing them to survive and reproduce more successfully.

Multiple choice

What is the term for the gradual change in the genetic makeup of a population over time?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Evolution
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Evolution is the gradual change in the genetic makeup of a population over time. Evolution occurs when natural selection favors certain alleles over others, leading to a change in the frequency of those alleles in the population.

Multiple choice

What is the term for the process by which new species are formed?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Speciation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Speciation is the process by which new species are formed. Speciation can occur through a variety of mechanisms, including geographic isolation, reproductive isolation, and natural selection.

Multiple choice

What is the term for the measure of genetic variation within a population?

  1. Genetic diversity

  2. Heterozygosity

  3. Allelic richness

  4. Effective population size
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Genetic diversity is the measure of genetic variation within a population. Genetic diversity can be measured using a variety of metrics, including heterozygosity, allelic richness, and effective population size.

Multiple choice

What is the term for the measure of genetic variation between populations?

  1. Genetic diversity

  2. Heterozygosity

  3. Allelic richness

  4. Genetic differentiation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Genetic differentiation is the measure of genetic variation between populations. Genetic differentiation can be measured using a variety of metrics, including F-statistics and Nei's genetic distance.

Multiple choice

What is the term for the process by which genetic variation is lost from a population?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Genetic drift
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Genetic drift is the process by which genetic variation is lost from a population. Genetic drift can occur due to a variety of factors, including natural disasters, population bottlenecks, and founder effects.

Multiple choice

What is the term for the process by which genetic variation is increased in a population?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Genetic drift
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mutation is the process by which genetic variation is increased in a population. Mutation can occur spontaneously or be induced by environmental factors.

Multiple choice

What is the term for the process by which genetic variation is maintained in a population?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Balancing selection
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Balancing selection is the process by which genetic variation is maintained in a population. Balancing selection can occur when there are multiple alleles at a locus that are favored by natural selection.

Multiple choice

What is the term for the process by which genetic variation is reduced in a population?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Genetic drift
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Genetic drift is the process by which genetic variation is reduced in a population. Genetic drift can occur due to a variety of factors, including natural disasters, population bottlenecks, and founder effects.

Multiple choice

What is the term for the process by which genetic variation is increased in a population?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Genetic drift
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mutation is the process by which genetic variation is increased in a population. Mutation can occur spontaneously or be induced by environmental factors.

Multiple choice

What is the term for the process by which genetic variation is maintained in a population?

  1. Mutation

  2. Recombination

  3. Gene flow

  4. Balancing selection
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Balancing selection is the process by which genetic variation is maintained in a population. Balancing selection can occur when there are multiple alleles at a locus that are favored by natural selection.

Multiple choice

What is the relationship between metapopulation dynamics and genetic diversity?

  1. Metapopulation dynamics can promote genetic diversity

  2. Metapopulation dynamics can reduce genetic diversity

  3. Metapopulation dynamics has no effect on genetic diversity

  4. The relationship between metapopulation dynamics and genetic diversity is unclear
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metapopulation dynamics can promote genetic diversity by facilitating gene flow between populations, reducing the risk of genetic drift and inbreeding, and allowing for the exchange of genetic material.