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

Which of the following is an example of a sufficient cause in biology?

  1. A genetic mutation

  2. A bacterial infection

  3. A change in temperature

  4. A chemical reaction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A bacterial infection is a sufficient cause for the development of a disease, as it is always sufficient to produce the disease.

Multiple choice

Which of the following is an example of a conditional cause in biology?

  1. A genetic mutation

  2. A bacterial infection

  3. A change in temperature

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

A genetic mutation is a conditional cause for the development of a disease, as it is both necessary and sufficient to produce the disease.

Multiple choice

Which of the following is an example of a necessary cause in biology?

  1. A genetic mutation

  2. A bacterial infection

  3. A change in temperature

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

A genetic mutation is a necessary cause for the expression of that gene, but it is not sufficient to guarantee expression.

Multiple choice

How does genetic modification contribute to forest adaptation strategies?

  1. By increasing tree resistance to pests and diseases

  2. By enhancing tree growth rate

  3. By improving tree tolerance to drought and heat

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

Genetic modification can be used to enhance tree resistance to pests and diseases, increase tree growth rate, and improve tree tolerance to drought and heat, thereby contributing to forest adaptation strategies.

Multiple choice

Which theory suggests that aging is a result of the accumulation of genetic mutations over time?

  1. Mutation Accumulation Theory

  2. Free Radical Theory

  3. Programmed Aging Theory

  4. Telomere Shortening Theory
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Mutation Accumulation Theory proposes that aging is caused by the accumulation of genetic mutations that impair cellular function and contribute to age-related decline.

Multiple choice

What is the term used to describe heritable changes in gene expression that do not involve changes in the DNA sequence?

  1. Epigenetics

  2. Gene Mutation

  3. Genetic Drift

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

Epigenetics refers to heritable changes in gene expression that occur without changes in the DNA sequence.

Multiple choice

What is the term used to describe the phenomenon where a gene is expressed differently in different tissues or cell types of an organism?

  1. Tissue-Specific Expression

  2. Genetic Mosaicism

  3. Epigenetic Regulation

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

Tissue-specific expression refers to the phenomenon where a gene is expressed differently in different tissues or cell types of an organism, resulting in variations in gene activity.

Multiple choice

What is the term used to describe the phenomenon where epigenetic modifications are passed on from one generation to the next?

  1. Transgenerational Epigenetics

  2. Genetic Inheritance

  3. Somatic Mutations

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

Transgenerational epigenetics refers to the phenomenon where epigenetic modifications are passed on from one generation to the next, potentially influencing traits and characteristics in subsequent generations.

Multiple choice

Which of the following is NOT a common welfare concern associated with genetic selection in poultry?

  1. Increased susceptibility to disease

  2. Reduced genetic diversity

  3. Improved feed efficiency

  4. Increased risk of behavioral problems
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Improved feed efficiency is not a common welfare concern associated with genetic selection in poultry. In fact, genetic selection has been used to improve feed efficiency, which can have positive implications for welfare by reducing the amount of feed required to produce the same amount of product.

Multiple choice

According to the diathesis-stress model, what is the relationship between genetic vulnerability and environmental stressors in the development of mental disorders?

  1. Genetic vulnerability increases the risk of developing a mental disorder, while environmental stressors act as triggers.

  2. Environmental stressors increase the risk of developing a mental disorder, while genetic vulnerability acts as a protective factor.

  3. Genetic vulnerability and environmental stressors have no relationship to the development of mental disorders.

  4. Genetic vulnerability and environmental stressors are equally important in the development of mental disorders.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The diathesis-stress model suggests that genetic vulnerability increases the risk of developing a mental disorder, while environmental stressors, such as traumatic experiences or chronic stress, act as triggers that can precipitate the onset of a disorder.

Multiple choice

What is a genetic variant?

  1. A change in the DNA sequence

  2. A change in the protein sequence

  3. A change in the gene expression

  4. A change in the chromosome structure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A genetic variant is a change in the DNA sequence that can occur in a single nucleotide or a larger region of the genome.

Multiple choice

What is a single nucleotide polymorphism (SNP)?

  1. A variation in a single nucleotide in the DNA sequence

  2. A variation in a single amino acid in the protein sequence

  3. A variation in the gene expression

  4. A variation in the chromosome structure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A single nucleotide polymorphism (SNP) is a variation in a single nucleotide in the DNA sequence that occurs at a specific position in the genome.

Multiple choice

What is linkage disequilibrium?

  1. The non-random association of alleles at two or more genetic loci

  2. The random association of alleles at two or more genetic loci

  3. The association of alleles at two or more genetic loci that is due to chance

  4. The association of alleles at two or more genetic loci that is due to selection
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Linkage disequilibrium is the non-random association of alleles at two or more genetic loci.

Multiple choice

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

  1. Genome

  2. Exome

  3. Proteome

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

Genome refers to the complete set of genetic material, including all the genes, in an individual.

Multiple choice

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

  1. Population Genetics

  2. Molecular Evolution

  3. Phylogenetics

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

Population genetics focuses on the genetic variation, allele frequencies, and evolutionary forces shaping the genetic makeup of populations.