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

What is the name of the genetic test that is used to identify individuals who are at high risk of developing breast or ovarian cancer?

  1. BRCA1/BRCA2 test

  2. Mammogram

  3. Ultrasound

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

The BRCA1/BRCA2 test is a genetic test that is used to identify individuals who have inherited mutations in the BRCA1 or BRCA2 genes. These mutations increase the risk of developing breast and ovarian cancer.

Multiple choice

Which of the following is NOT a genetic disorder?

  1. Sickle cell anemia

  2. Cystic fibrosis

  3. Down syndrome

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

Cancer is not a genetic disorder, although it can be caused by genetic mutations. Genetic disorders are caused by changes in the DNA sequence that are inherited from parents.

Multiple choice

What is the term for a genetic test that can identify individuals who are at risk for a particular genetic disorder?

  1. Prenatal screening

  2. Carrier screening

  3. Diagnostic testing

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

Predictive testing is a genetic test that can identify individuals who are at risk for a particular genetic disorder, even if they do not have any symptoms.

Multiple choice

Which of the following is an example of a congenital anomaly?

  1. Cleft lip

  2. Down syndrome

  3. Autism

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

A congenital anomaly is a birth defect that occurs during embryonic development. Cleft lip is an example of a congenital anomaly.

Multiple choice

Which of the following is a common genetic cause of Alzheimer's disease?

  1. Apolipoprotein E (APOE) gene

  2. Huntington's disease gene

  3. Parkinson's disease gene

  4. Amyotrophic lateral sclerosis (ALS) gene
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The APOE gene is a well-established genetic risk factor for Alzheimer's disease. Variations in the APOE gene, particularly the APOE4 allele, have been associated with an increased risk of developing the disease.

Multiple choice

What is the primary molecular mechanism underlying Huntington's disease?

  1. Expansion of a CAG repeat in the huntingtin gene

  2. Mutation in the alpha-synuclein gene

  3. Loss of dopamine neurons in the substantia nigra

  4. Accumulation of amyloid-beta plaques in the brain
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Huntington's disease is caused by an expansion of a CAG repeat within the huntingtin gene. This expansion leads to the production of a mutant huntingtin protein with an elongated polyglutamine tract, which is toxic to neurons.

Multiple choice

Which genetic mutation is associated with familial amyotrophic lateral sclerosis (ALS)?

  1. Mutation in the SOD1 gene

  2. Expansion of a CAG repeat in the huntingtin gene

  3. Mutation in the alpha-synuclein gene

  4. Mutation in the APOE gene
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mutations in the SOD1 gene, which encodes the antioxidant enzyme superoxide dismutase 1, are associated with familial ALS.

Multiple choice

Which of these is an example of incomplete dominance in humans?

  1. ABO blood group system

  2. Cystic fibrosis

  3. Sickle cell anemia

  4. Huntington's disease
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The ABO blood group system in humans is an example of incomplete dominance, where the alleles A and B are codominant, resulting in blood types A, B, AB, and O.

Multiple choice

Which of the following is an example of a cell polarity defect?

  1. Cancer

  2. Neurodegenerative diseases

  3. Developmental disorders

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

Cell polarity defects can contribute to various diseases, including cancer, neurodegenerative diseases, and developmental disorders.

Multiple choice

Which of the following is NOT a common type of birth defect?

  1. Neural tube defects

  2. Cleft lip and palate

  3. Down syndrome

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

Autism spectrum disorder is a neurodevelopmental disorder, not a birth defect.

Multiple choice

What is the term used to describe a birth defect that is caused by a single gene mutation?

  1. Mendelian disorder

  2. Chromosomal disorder

  3. Multifactorial disorder

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

A Mendelian disorder is a birth defect that is caused by a single gene mutation.

Multiple choice

What is the term used to describe a birth defect that is caused by a combination of genetic and environmental factors?

  1. Mendelian disorder

  2. Chromosomal disorder

  3. Multifactorial disorder

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

A multifactorial disorder is a birth defect that is caused by a combination of genetic and environmental factors.

Multiple choice

Which of the following is NOT a common type of multifactorial disorder?

  1. Congenital heart defects

  2. Neural tube defects

  3. Cleft lip and palate

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

Autism spectrum disorder is a neurodevelopmental disorder, not a multifactorial disorder.

Multiple choice

Which of the following is NOT a common type of congenital anomaly?

  1. Cleft lip and palate

  2. Down syndrome

  3. Autism spectrum disorder

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

Autism spectrum disorder is a neurodevelopmental condition that is not typically considered a congenital anomaly in the same way as physical birth defects like cleft lip and palate or clubfoot.

Multiple choice

What type of genetic alteration can lead to the activation of oncogenes?

  1. Gene amplification

  2. Gene deletion

  3. Point mutation

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

Point mutations can activate oncogenes by introducing changes in the protein structure or function.