Biology

Human Genetics and Disorders

882 Questions

Human Genetics and Disorders covers the inheritance patterns, genetic mutations, and molecular basis of hereditary diseases. Topics include sex-linked traits, cancer genetics, and metabolic disorders. This section tests knowledge critical for biology exams and general science papers.

Genetic mutationsInherited disordersCancer geneticsGenetic testingMendelian inheritance

Human Genetics and Disorders Questions

Multiple choice

Which type of genetic test is used to detect gene fusions, which are genetic rearrangements that can drive cancer development?

  1. Karyotyping

  2. Polymerase Chain Reaction (PCR)

  3. Fluorescence In Situ Hybridization (FISH)

  4. RNA Sequencing (RNA-Seq)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

RNA Sequencing (RNA-Seq) is a genetic test that analyzes the expression levels of RNA molecules in a cell. It can be used to detect gene fusions, which are genetic rearrangements that result in the fusion of two or more genes. Gene fusions can lead to the production of abnormal proteins that contribute to cancer development and progression.

Multiple choice

Which type of genetic test is used to detect microsatellite instability (MSI), a genetic alteration associated with certain types of cancer?

  1. Karyotyping

  2. Polymerase Chain Reaction (PCR)

  3. Fluorescence In Situ Hybridization (FISH)

  4. Immunohistochemistry (IHC)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Polymerase Chain Reaction (PCR) is a genetic test that amplifies specific regions of DNA. It is used to detect microsatellite instability (MSI), which is a genetic alteration characterized by the presence of repetitive DNA sequences that are prone to mutations. MSI can be associated with certain types of cancer, such as colorectal cancer and endometrial cancer.

Multiple choice

Which type of genetic test is used to detect loss of heterozygosity (LOH), a genetic alteration associated with the inactivation of tumor suppressor genes?

  1. Karyotyping

  2. Polymerase Chain Reaction (PCR)

  3. Fluorescence In Situ Hybridization (FISH)

  4. Single Nucleotide Polymorphism (SNP) Array
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Single Nucleotide Polymorphism (SNP) Array is a genetic test that analyzes variations in single nucleotides across the genome. It can be used to detect loss of heterozygosity (LOH), which is a genetic alteration characterized by the loss of one copy of a gene, often leading to the inactivation of tumor suppressor genes and contributing to cancer development.

Multiple choice

What is the primary cause of sickle cell anemia?

  1. Genetic mutation

  2. Environmental factors

  3. Nutritional deficiencies

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

Sickle cell anemia is caused by a genetic mutation that results in the production of abnormal hemoglobin.

Multiple choice

What is the term for a genetic disorder caused by a mutation in a single gene:

  1. Monogenic disorder

  2. Polygenic disorder

  3. Multifactorial disorder

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

A genetic disorder caused by a mutation in a single gene is called a monogenic disorder.

Multiple choice

Which of the following is an example of a polygenic disorder:

  1. Heart disease

  2. Cancer

  3. Diabetes

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

Heart disease, cancer, and diabetes are all examples of polygenic disorders.

Multiple choice

What is the term for a genetic disorder caused by a mutation in multiple genes:

  1. Monogenic disorder

  2. Polygenic disorder

  3. Multifactorial disorder

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

A genetic disorder caused by a mutation in multiple genes is called a polygenic disorder.

Multiple choice

Which of the following is an example of a multifactorial disorder:

  1. Cleft lip and palate

  2. Neural tube defects

  3. Congenital heart defects

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

Cleft lip and palate, neural tube defects, and congenital heart defects are all examples of multifactorial disorders.

Multiple choice

What is the term for a genetic disorder caused by a mutation in a chromosome:

  1. Monogenic disorder

  2. Polygenic disorder

  3. Multifactorial disorder

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

A genetic disorder caused by a mutation in a chromosome is called a chromosomal disorder.

Multiple choice

Which theory suggests that aging is caused by the shortening of telomeres, the protective caps at the ends of chromosomes?

  1. Telomere Shortening Theory

  2. Free Radical Theory

  3. Programmed Aging Theory

  4. Wear-and-Tear Theory
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Telomere Shortening Theory proposes that aging is caused by the progressive shortening of telomeres, which eventually leads to cellular dysfunction and death.

Multiple choice

What is a genome-wide association study (GWAS)?

  1. A study that examines the association between genetic variants and a particular trait or disease

  2. A study that examines the association between gene expression and a particular trait or disease

  3. A study that examines the association between protein expression and a particular trait or disease

  4. A study that examines the association between environmental factors and a particular trait or disease
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A genome-wide association study (GWAS) is a study that examines the association between genetic variants and a particular trait or disease.

Multiple choice

What is the name of the protein that is often mutated in cancer cells, leading to uncontrolled cell growth?

  1. p53

  2. BRCA1

  3. BRCA2

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

The p53 protein is often mutated in cancer cells, leading to uncontrolled cell growth and tumor formation.

Multiple choice

Which of the following is a common genetic disease that affects the respiratory system in children?

  1. Cystic fibrosis

  2. Sickle cell anemia

  3. Down syndrome

  4. Tay-Sachs disease
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cystic fibrosis is a genetic disease that affects the lungs, digestive system, and other organs. It is caused by a mutation in the CFTR gene, which leads to the production of thick, sticky mucus that can clog the airways and cause breathing problems.

Multiple choice

What is the most common genetic disease in children?

  1. Down syndrome

  2. Cystic fibrosis

  3. Sickle cell anemia

  4. Tay-Sachs disease
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Down syndrome is a genetic disorder caused by the presence of an extra copy of chromosome 21. It is the most common genetic cause of intellectual disability and can also lead to a variety of physical and medical problems.

Multiple choice

Which of the following is a genetic disease that affects the blood?

  1. Cystic fibrosis

  2. Sickle cell anemia

  3. Down syndrome

  4. Tay-Sachs disease
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sickle cell anemia is a genetic disease that affects the shape of red blood cells. It is caused by a mutation in the beta-globin gene, which leads to the production of abnormal hemoglobin molecules that can cause red blood cells to become sickle-shaped.