Biology

Genetics and Evolutionary Biology

1,123 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 polygenic inheritance affect the heritability of a trait?

  1. Heritability is higher for polygenic traits than for monogenic traits.

  2. Heritability is lower for polygenic traits than for monogenic traits.

  3. Heritability is the same for polygenic traits and monogenic traits.

  4. Heritability cannot be estimated for polygenic traits.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Heritability is higher for polygenic traits than for monogenic traits because polygenic traits are influenced by a larger number of genes. This means that there is more genetic variation for polygenic traits, which leads to a higher heritability.

Multiple choice

What is the term used to describe the process by which organisms with advantageous traits are more likely to survive and reproduce, passing on those traits to their offspring?

  1. Natural selection

  2. Genetic drift

  3. Mutation

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

Natural selection is the process by which organisms with advantageous traits are more likely to survive and reproduce, passing on those traits to their offspring.

Multiple choice

What is the term used to describe the gradual change in the genetic composition of a population over time?

  1. Evolution

  2. Adaptation

  3. Genetic drift

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

Genetic drift is the gradual change in the genetic composition of a population over time, due to random fluctuations in gene frequencies.

Multiple choice

What is the term used to describe the process by which genetic material is randomly transferred from one organism to another?

  1. Gene flow

  2. Genetic drift

  3. Mutation

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

Gene flow is the process by which genetic material is randomly transferred from one organism to another, typically through mating or migration.

Multiple choice

What is the term used to describe the process by which the genetic makeup of a population changes due to non-random mating patterns?

  1. Genetic drift

  2. Gene flow

  3. Mutation

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

Sexual selection is the process by which the genetic makeup of a population changes due to non-random mating patterns, typically driven by mate choice preferences.

Multiple choice

What is the term used to describe the process by which the genetic makeup of a population changes due to the introduction of new genetic material?

  1. Mutation

  2. Gene flow

  3. Genetic drift

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

Hybridization is the process by which the genetic makeup of a population changes due to the introduction of new genetic material through interbreeding between different species or populations.

Multiple choice

What is the term used to describe the process by which the genetic makeup of a population changes due to the loss of genetic diversity?

  1. Genetic drift

  2. Gene flow

  3. Mutation

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

The bottleneck effect is the process by which the genetic makeup of a population changes due to the loss of genetic diversity, typically caused by a drastic reduction in population size.

Multiple choice

What is the term used to describe the process by which the genetic makeup of a population changes due to the expansion of a small group of individuals?

  1. Founder effect

  2. Genetic drift

  3. Gene flow

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

The founder effect is the process by which the genetic makeup of a population changes due to the expansion of a small group of individuals, typically leading to a reduction in genetic diversity.

Multiple choice

What is epistasis?

  1. The interaction between two or more genes that control the same trait

  2. The interaction between two or more genes that control different traits

  3. The interaction between a gene and the environment

  4. The interaction between two or more genes that control the same trait, resulting in a new phenotype
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Epistasis is a phenomenon in which the expression of one gene is modified by the presence of one or more other genes.

Multiple choice

What is the importance of epistasis in genetics?

  1. Epistasis helps to explain the inheritance of complex traits

  2. Epistasis helps to identify the genes responsible for genetic diseases

  3. Epistasis helps to develop new drugs and treatments for genetic diseases

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

Epistasis is important in genetics because it helps to explain the inheritance of complex traits, identify the genes responsible for genetic diseases, and develop new drugs and treatments for genetic diseases.

Multiple choice

What is a mutation?

  1. A change in the DNA sequence

  2. A change in the RNA sequence

  3. A change in the protein sequence

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

A mutation is a change in the DNA sequence. Mutations can be caused by a variety of factors, including exposure to radiation, chemicals, and errors during DNA replication.

Multiple choice

What is the difference between a genotype and a phenotype?

  1. A genotype is the genetic makeup of an organism, while a phenotype is the observable characteristics of an organism.

  2. A genotype is the observable characteristics of an organism, while a phenotype is the genetic makeup of an organism.

  3. A genotype is the genetic makeup of an organism, while a phenotype is the genetic makeup of an organism's parents.

  4. A genotype is the observable characteristics of an organism, while a phenotype is the observable characteristics of an organism's parents.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A genotype is the genetic makeup of an organism. A phenotype is the observable characteristics of an organism.

Multiple choice

Which of the following is NOT a type of genetic variation?

  1. Single nucleotide polymorphism (SNP)

  2. Insertion/deletion polymorphism (InDel)

  3. Copy number variation (CNV)

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

Epigenetic modification is not a type of genetic variation. Single nucleotide polymorphism (SNP), insertion/deletion polymorphism (InDel), and copy number variation (CNV) are all types of genetic variation.

Multiple choice

What is genetic diversity?

  1. The variety of different genes and alleles in a population.

  2. The number of different species in an ecosystem.

  3. The number of different habitats in an ecosystem.

  4. The number of different individuals in a population.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Genetic diversity is the variety of different genes and alleles in a population. It is important for the survival of a species because it allows for adaptation to changing environmental conditions.

Multiple choice

How does thermal pollution affect genetic diversity?

  1. It can cause mutations in genes.

  2. It can lead to the loss of genetic diversity.

  3. It can increase genetic diversity.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Thermal pollution can lead to the loss of genetic diversity by causing mutations in genes and by selecting for certain genotypes that are more tolerant of high temperatures.