Biology

Human Genetics and Disorders

844 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 role of genetic testing in Celiac Disease?

  1. To confirm a diagnosis of Celiac Disease

  2. To predict the risk of developing Celiac Disease

  3. To determine the severity of Celiac Disease

  4. To identify individuals who may benefit from a gluten-free diet
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Genetic testing for specific gene variations associated with Celiac Disease can help predict the risk of developing the condition, particularly in individuals with a family history of Celiac Disease. It does not confirm a diagnosis, determine the severity of the disease, or identify individuals who may benefit from a gluten-free diet.

Multiple choice

Which of the following is not a risk factor for ASD?

  1. Family history of ASD

  2. Advanced paternal age

  3. Low birth weight

  4. Maternal rubella infection during pregnancy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Maternal rubella infection during pregnancy is not a risk factor for ASD.

Multiple choice

What is the most common type of congenital adrenal hyperplasia?

  1. 21-hydroxylase deficiency

  2. 11-beta-hydroxylase deficiency

  3. 17-alpha-hydroxylase deficiency

  4. 3-beta-hydroxysteroid dehydrogenase deficiency
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

21-hydroxylase deficiency is the most common type of congenital adrenal hyperplasia. It is an inherited disorder that affects the production of cortisol and aldosterone, two hormones that are essential for life.

Multiple choice

What is the most common cause of Klinefelter syndrome?

  1. Nondisjunction

  2. Translocation

  3. Deletion

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

Nondisjunction is the most common cause of Klinefelter syndrome. It is a genetic disorder that occurs when an extra copy of the X chromosome is present in males.

Multiple choice

What is the most common cause of Prader-Willi syndrome?

  1. Deletion of chromosome 15q11-q13

  2. Uniparental disomy of chromosome 15

  3. Imprinting defect

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

Deletion of chromosome 15q11-q13 is the most common cause of Prader-Willi syndrome. It is a genetic disorder that affects males and females. Symptoms of Prader-Willi syndrome can include short stature, obesity, hypotonia, and mental retardation.

Multiple choice

What is the most common cause of Russell-Silver syndrome?

  1. Unknown

  2. Genetic mutation

  3. Environmental factors

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

The cause of Russell-Silver syndrome is unknown. It is a genetic disorder that affects males and females. Symptoms of Russell-Silver syndrome can include short stature, failure to thrive, and feeding difficulties.

Multiple choice

Which type of cancer is commonly associated with mutations in the BRAF gene?

  1. Melanoma

  2. Lung cancer

  3. Breast cancer

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

Melanoma is commonly associated with mutations in the BRAF gene. BRAF is a protein involved in the MAPK signaling pathway, which plays a role in cell growth and proliferation. Mutations in BRAF can lead to uncontrolled cell growth and the development of melanoma.

Multiple choice

Which genetic mutation is most strongly associated with an increased risk of developing Alzheimer's disease?

  1. APOE-e4 allele

  2. APP gene mutation

  3. PSEN1 gene mutation

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

The APOE-e4 allele of the apolipoprotein E gene is the most strongly associated with an increased risk of developing Alzheimer's disease.

Multiple choice

Which genetic mutation is most strongly associated with an increased risk of developing Parkinson's disease?

  1. SNCA gene mutation

  2. LRRK2 gene mutation

  3. GBA gene mutation

  4. PARK2 gene mutation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mutations in the SNCA gene, which encodes alpha-synuclein, are the most strongly associated with an increased risk of developing Parkinson's disease.

Multiple choice

What is the leading genetic cause of intellectual disability?

  1. Down syndrome

  2. Fragile X syndrome

  3. Angelman syndrome

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

Down syndrome is the leading genetic cause of intellectual disability, accounting for about 10% of cases. It is caused by an extra copy of chromosome 21 and is characterized by a range of physical and intellectual disabilities.

Multiple choice

What is the most common type of muscular dystrophy in children?

  1. Duchenne muscular dystrophy

  2. Becker muscular dystrophy

  3. Emery-Dreifuss muscular dystrophy

  4. Limb-girdle muscular dystrophy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Duchenne muscular dystrophy is the most common type of muscular dystrophy in children, affecting about 1 in 3,500 boys. It is a progressive muscle-wasting disorder that typically begins in early childhood and leads to severe disability and death by the early 20s.

Multiple choice

What is the role of genetics in atherosclerosis?

  1. Genetics play a significant role in the development of atherosclerosis

  2. Genetics play a minor role in the development of atherosclerosis

  3. Genetics have no role in the development of atherosclerosis

  4. Genetics only play a role in the development of atherosclerosis in certain populations
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Genetics play a significant role in the development of atherosclerosis. People who have a family history of atherosclerosis are more likely to develop the condition.

Multiple choice

Which genetic disorder is characterized by the presence of an extra copy of chromosome 21?

  1. Down syndrome

  2. Turner syndrome

  3. Cystic fibrosis

  4. Sickle cell anemia
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 characterized by physical and developmental differences, including intellectual disability, distinctive facial features, and short stature.

Multiple choice

What is the most common type of genetic testing used to screen for genetic disorders in newborns?

  1. Amniocentesis

  2. Chorionic villus sampling (CVS)

  3. Newborn screening

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

Newborn screening is a routine test performed shortly after birth to identify genetic disorders that may not be immediately apparent. It involves collecting a blood sample from the baby's heel and testing it for various genetic conditions.

Multiple choice

Which genetic disorder is characterized by the inability of the body to produce the enzyme lactase, resulting in difficulty digesting lactose?

  1. Lactose intolerance

  2. Celiac disease

  3. Irritable bowel syndrome (IBS)

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

Lactose intolerance is a genetic disorder caused by the body's inability to produce the enzyme lactase, which is necessary for digesting lactose, the sugar found in milk and dairy products.