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

How does recombination contribute to genetic diversity?

  1. By creating new gene combinations

  2. By introducing new mutations

  3. By increasing the frequency of existing alleles

  4. By decreasing the frequency of existing alleles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Recombination, which occurs during meiosis, creates new gene combinations by exchanging genetic material between homologous chromosomes.

Multiple choice

What is the term used to describe the movement of genes from one population to another?

  1. Gene flow

  2. Migration

  3. Dispersal

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

Gene flow refers to the movement of genes from one population to another, typically through the migration of individuals or the exchange of gametes.

Multiple choice

How does gene flow affect genetic diversity?

  1. It increases genetic diversity

  2. It decreases genetic diversity

  3. It has no effect on genetic diversity

  4. It depends on the direction of gene flow
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gene flow increases genetic diversity by introducing new alleles and gene combinations into a population.

Multiple choice

What is the term used to describe the change in allele frequencies in a population over time?

  1. Genetic drift

  2. Natural selection

  3. Gene flow

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

Genetic drift refers to the change in allele frequencies in a population over time due to random chance, rather than natural selection.

Multiple choice

What is the primary mechanism that drives genetic drift?

  1. Mutation

  2. Recombination

  3. Gene flow

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

Genetic drift is primarily driven by random sampling, which occurs when a small number of individuals are selected to reproduce, leading to changes in allele frequencies.

Multiple choice

How does genetic drift affect genetic diversity?

  1. It increases genetic diversity

  2. It decreases genetic diversity

  3. It has no effect on genetic diversity

  4. It depends on the population size
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Genetic drift decreases genetic diversity by reducing the number of alleles and gene combinations in a population.

Multiple choice

What is the term used to describe the process by which natural selection favors certain alleles or genotypes?

  1. Genetic drift

  2. Natural selection

  3. Gene flow

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

Natural selection is the process by which certain alleles or genotypes are favored in a population due to their increased fitness, leading to changes in allele frequencies.

Multiple choice

How does natural selection affect genetic diversity?

  1. It increases genetic diversity

  2. It decreases genetic diversity

  3. It has no effect on genetic diversity

  4. It depends on the strength of selection
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The effect of natural selection on genetic diversity depends on the strength of selection. Weak selection may increase genetic diversity by maintaining multiple alleles, while strong selection may decrease genetic diversity by favoring a single allele.

Multiple choice

What is the term used to describe the measure of genetic variation within a population?

  1. Genetic diversity

  2. Allelic diversity

  3. Phenotypic diversity

  4. Genotypic diversity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Genetic diversity is a measure of the genetic variation within a population, including differences in genes, alleles, and genotypes.

Multiple choice

How is genetic diversity typically measured?

  1. By calculating the number of alleles in a population

  2. By calculating the number of genotypes in a population

  3. By calculating the Hardy-Weinberg equilibrium

  4. By calculating the F-statistics
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Genetic diversity is typically measured using F-statistics, which quantify the amount of genetic differentiation between populations or the departure from Hardy-Weinberg equilibrium.

Multiple choice

Why is genetic diversity important?

  1. It increases the likelihood of survival of a species

  2. It allows for adaptation to changing environments

  3. It provides a buffer against disease

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Genetic diversity is important because it increases the likelihood of survival of a species, allows for adaptation to changing environments, and provides a buffer against disease.

Multiple choice

Which of the following is NOT a potential consequence of isolation in a metapopulation?

  1. Increased genetic drift

  2. Reduced gene flow

  3. Loss of genetic diversity

  4. Increased adaptive potential
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Isolation in a metapopulation typically leads to increased genetic drift, reduced gene flow, and loss of genetic diversity, rather than increased adaptive potential.

Multiple choice

Which model organism is often utilized to study the development of the urinary system?

  1. Mus musculus

  2. Rattus norvegicus

  3. Xenopus laevis

  4. Gallus gallus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mus musculus, commonly known as the mouse, is a widely used model organism for studying the development of the urinary system due to its genetic similarity to humans, well-established genetic tools, and the availability of genetically modified strains.

Multiple choice

What is genetic diversity?

  1. The variety of genes and alleles within a population

  2. The number of different species in an ecosystem

  3. The genetic makeup of an individual organism

  4. The presence of different habitats within an ecosystem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Genetic diversity refers to the variation in the genetic makeup of a population, including the variety of genes and alleles present.

Multiple choice

How does water pollution affect genetic diversity?

  1. It increases genetic diversity by introducing new genes into the population

  2. It decreases genetic diversity by reducing the number of individuals in the population

  3. It has no effect on genetic diversity

  4. It increases genetic diversity by increasing the mutation rate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water pollution can reduce genetic diversity by killing organisms and reducing the size of populations, leading to the loss of genetic variation.