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 seed dispersal contribute to the genetic diversity of plant populations?

  1. By reducing competition among seedlings near the parent plant

  2. By increasing the chances of seeds germinating in favorable conditions

  3. By promoting the spread of invasive species to new areas

  4. By facilitating the cross-pollination of flowers between different plants
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Seed dispersal increases genetic diversity by enabling seeds to be transported to new locations, where they can cross-pollinate with other plants of the same species, leading to the exchange of genetic material and the creation of new genetic combinations.

Multiple choice

What is a mutation?

  1. A change in the sequence of nucleotides in DNA or RNA

  2. A change in the structure of a protein

  3. A change in the function of a protein

  4. A change in the expression of a gene
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A mutation is a change in the sequence of nucleotides in DNA or RNA. Mutations can be caused by various factors, such as errors during DNA replication, exposure to radiation, or chemical agents.

Multiple choice

Which of the following is a type of oncogene?

  1. Growth factor receptors

  2. Transcription factors

  3. Signal transduction proteins

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

Oncogenes are genes that have the potential to cause cancer when mutated. They can encode growth factor receptors, transcription factors, signal transduction proteins, and other proteins that are involved in cell growth and proliferation.

Multiple choice

What is genetic diversity?

  1. The variety of genes within a population or species.

  2. The number of different species in an ecosystem.

  3. The genetic makeup of an individual organism.

  4. The amount of genetic variation between two populations.
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 or species. It is important for the survival and adaptation of a species, as it allows for different individuals to have different traits that may be beneficial in different environments.

Multiple choice

How does urbanization affect genetic diversity?

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

  2. It decreases genetic diversity by reducing the size of populations.

  3. It has no effect on genetic diversity.

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

Urbanization often leads to the fragmentation and isolation of populations, which can reduce the size of populations and decrease genetic diversity. This can make populations more vulnerable to the effects of environmental change and disease.

Multiple choice

What are the consequences of reduced genetic diversity?

  1. Increased susceptibility to disease.

  2. Reduced ability to adapt to environmental change.

  3. Increased risk of extinction.

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

Reduced genetic diversity can have a number of negative consequences, including increased susceptibility to disease, reduced ability to adapt to environmental change, and increased risk of extinction. This is because a population with low genetic diversity is less likely to have the genetic variation necessary to survive and adapt to changes in its environment.

Multiple choice

What is genetic diversity?

  1. The variation in the genetic makeup of a population

  2. The number of different species in an ecosystem

  3. The average genetic similarity between two individuals

  4. The percentage of individuals in a population that are homozygous
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Genetic diversity is the variation in the genetic makeup of a population. It is measured by the number of different alleles at a given locus, or by the average genetic similarity between two individuals.

Multiple choice

Why is genetic diversity important?

  1. It allows populations to adapt to changing environmental conditions

  2. It increases the productivity of ecosystems

  3. It reduces the risk of disease outbreaks

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

Genetic diversity is important for a number of reasons. It allows populations to adapt to changing environmental conditions, it increases the productivity of ecosystems, and it reduces the risk of disease outbreaks.

Multiple choice

What is the term used to describe the genetic makeup of an organism?

  1. Genotype

  2. Phenotype

  3. Allele

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

Genotype refers to the genetic composition of an organism, including the alleles present at specific gene loci.

Multiple choice

What is the term used to describe the observable characteristics of an organism?

  1. Genotype

  2. Phenotype

  3. Allele

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

Phenotype refers to the observable characteristics of an organism, such as its physical appearance, behavior, and biochemical properties.

Multiple choice

What is the term for the variation in the genetic makeup of a population?

  1. Genetic diversity

  2. Genetic uniformity

  3. Genetic drift

  4. Genetic bottleneck
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, which can be measured by the number of alleles at a given locus or the proportion of individuals with different genotypes.

Multiple choice

Which of the following is NOT a benefit of genetic diversity?

  1. Increased resistance to disease

  2. Increased adaptability to environmental changes

  3. Increased risk of inbreeding depression

  4. Increased productivity of agricultural crops
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Inbreeding depression is a decrease in the fitness of offspring that results from mating between closely related individuals. It is more likely to occur in populations with low genetic diversity.

Multiple choice

What is the term for the loss of genetic diversity due to a reduction in the size of a population?

  1. Genetic drift

  2. Genetic bottleneck

  3. Founder effect

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

A genetic bottleneck is a reduction in the size of a population that can lead to a loss of genetic diversity. This can occur due to natural disasters, hunting, or other factors.

Multiple choice

Which of the following is NOT a cause of genetic drift?

  1. Natural selection

  2. Mutation

  3. Migration

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

Natural selection is a process that leads to the differential survival and reproduction of individuals with certain traits. It is not a cause of genetic drift, which is a random process that can lead to changes in allele frequencies.

Multiple choice

What is the term for the introduction of new alleles into a population?

  1. Gene flow

  2. Mutation

  3. Genetic drift

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

Gene flow is the movement of alleles between populations. It can occur through migration, mating, or other mechanisms.