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 of the following is an example of a chromosomal disorder?

  1. Cystic Fibrosis

  2. Sickle Cell Anemia

  3. Down Syndrome

  4. Tay-Sachs Disease
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Down Syndrome is an example of a chromosomal disorder, meaning that it is caused by an abnormality in the number or structure of chromosomes. In this case, Down Syndrome is caused by the presence of an extra copy of chromosome 21.

Multiple choice

What is the inheritance pattern of Tay-Sachs Disease?

  1. Autosomal Dominant

  2. Autosomal Recessive

  3. X-Linked Dominant

  4. X-Linked Recessive
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Tay-Sachs Disease is an autosomal recessive genetic disorder, meaning that it is caused by a mutation in a gene located on one of the non-sex chromosomes (autosomes). In this case, the mutation is in the HEXA gene, and two copies of the mutated gene (one from each parent) are required for the disorder to manifest.

Multiple choice

Which of the following is a genetic disorder caused by a mutation in the DMD gene?

  1. Cystic Fibrosis

  2. Sickle Cell Anemia

  3. Huntington's Disease

  4. Duchenne Muscular Dystrophy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Duchenne Muscular Dystrophy is a genetic disorder caused by a mutation in the DMD gene, which leads to the production of defective dystrophin protein. Dystrophin is a protein that helps maintain the structural integrity of muscle cells, and its dysfunction results in progressive muscle weakness and degeneration.

Multiple choice

What is the most common genetic disorder among males?

  1. Cystic Fibrosis

  2. Sickle Cell Anemia

  3. Huntington's Disease

  4. Duchenne Muscular Dystrophy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Duchenne Muscular Dystrophy is the most common genetic disorder among males, affecting approximately 1 in every 3,500 male births. It is caused by a mutation in the DMD gene, which leads to the production of defective dystrophin protein.

Multiple choice

Which of the following is an example of a mitochondrial disorder?

  1. Cystic Fibrosis

  2. Sickle Cell Anemia

  3. Huntington's Disease

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

Leigh Syndrome is an example of a mitochondrial disorder, meaning that it is caused by a mutation in mitochondrial DNA. Mitochondrial DNA is the DNA that is present in mitochondria, the organelles responsible for energy production in cells. Mutations in mitochondrial DNA can lead to a variety of health problems, including Leigh Syndrome, which is characterized by progressive neurological degeneration.

Multiple choice

What is the inheritance pattern of Fragile X Syndrome?

  1. Autosomal Dominant

  2. Autosomal Recessive

  3. X-Linked Dominant

  4. X-Linked Recessive
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fragile X Syndrome is an X-linked recessive genetic disorder, meaning that it is caused by a mutation in a gene located on the X chromosome. In this case, the mutation is in the FMR1 gene, and males are more commonly affected than females due to the presence of only one X chromosome in males.

Multiple choice

Which of the following is a genetic disorder caused by a mutation in the BRCA1 or BRCA2 genes?

  1. Cystic Fibrosis

  2. Sickle Cell Anemia

  3. Huntington's Disease

  4. Hereditary Breast and Ovarian Cancer Syndrome
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hereditary Breast and Ovarian Cancer Syndrome is a genetic disorder caused by mutations in the BRCA1 or BRCA2 genes. These genes are involved in DNA repair, and mutations in these genes increase the risk of developing breast cancer and ovarian cancer.

Multiple choice

What is the most common genetic disorder among Ashkenazi Jews?

  1. Cystic Fibrosis

  2. Sickle Cell Anemia

  3. Tay-Sachs Disease

  4. Huntington's Disease
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tay-Sachs Disease is the most common genetic disorder among Ashkenazi Jews, affecting approximately 1 in every 3,600 Ashkenazi Jewish newborns. It is caused by a mutation in the HEXA gene, which leads to the accumulation of toxic substances in the brain.

Multiple choice

Which of the following is a genetic disorder caused by a trinucleotide repeat expansion?

  1. Cystic Fibrosis

  2. Sickle Cell Anemia

  3. Huntington's Disease

  4. Fragile X Syndrome
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Huntington's Disease is a genetic disorder caused by a trinucleotide repeat expansion in the HTT gene. Trinucleotide repeat expansions are a type of genetic mutation in which a specific sequence of three nucleotides is repeated multiple times. In the case of Huntington's Disease, the CAG trinucleotide is repeated excessively, leading to the production of a toxic protein that causes progressive neurological degeneration.

Multiple choice

What is the genetic mutation associated with Huntington's disease?

  1. CAG trinucleotide repeat expansion in the HTT gene

  2. SNCA gene mutation

  3. APP gene mutation

  4. MAPT gene mutation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Huntington's disease is caused by a CAG trinucleotide repeat expansion in the HTT gene, which leads to the production of a mutant huntingtin protein.

Multiple choice

Which of the following is a characteristic feature of rare diseases?

  1. They affect a large population.

  2. They are often genetic in origin.

  3. They have well-established treatment options.

  4. They are easily diagnosed.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rare diseases are often caused by genetic mutations or abnormalities, making them hereditary in nature.

Multiple choice

What is the significance of orphan drugs in the treatment of rare diseases?

  1. They are specifically designed for rare diseases.

  2. They receive accelerated approval from regulatory agencies.

  3. They are often granted market exclusivity.

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

Orphan drugs are specifically designed for rare diseases, receive accelerated approval, and are often granted market exclusivity to encourage their development.

Multiple choice

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

  1. Single-gene disorder

  2. Chromosomal disorder

  3. Multifactorial disorder

  4. Mitochondrial disorder
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Multifactorial disorders are not genetic disorders in the strict sense, as they are caused by a combination of genetic and environmental factors.

Multiple choice

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

  1. Single-gene disorder

  2. Chromosomal disorder

  3. Multifactorial disorder

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

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

Multiple choice

What is a genetic disorder?

  1. A disorder that is caused by a mutation in a gene

  2. A disorder that is caused by a mutation in a chromosome

  3. A disorder that is caused by a mutation in a protein

  4. A disorder that is caused by a mutation in a cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A genetic disorder is a disorder that is caused by a mutation in a gene. Mutations can change the structure and function of proteins, which can lead to a variety of health problems. Genetic disorders can be inherited from parents or they can occur spontaneously.