Genetic Disorders Quiz - CBSE Class 12 Biology

Free practice quiz: Genetic Disorders (CBSE Class 12 Biology). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is a chromosomal disorder?

   1. Phenylketonuria
   2. Sickle cell anemia
   3. Down syndrome
   4. Albinism
   Show answer

   Answer: C. Down syndrome

   Down syndrome is a chromosomal disorder caused by an extra copy of chromosome 21. Phenylketonuria, sickle cell anemia, and albinism are genetic disorders but not chromosomal disorders.

2. Klinefelter syndrome is characterized by which chromosomal abnormality?

   1. XXY
   2. XO
   3. XXX
   4. XYY
   Show answer

   Answer: A. XXY

   Klinefelter syndrome is characterized by the presence of an extra X chromosome in males (XXY).

3. How can genetic counseling help individuals with a family history of genetic disorders?

   1. It can guarantee the prevention of all genetic disorders.
   2. It provides information about the risk of having a child with a genetic disorder.
   3. It is unnecessary if there is no known family history of genetic disorders.
   4. It directly changes the genetic makeup of the individual.
   Show answer

   Answer: B. It provides information about the risk of having a child with a genetic disorder.

   Genetic counseling helps assess the risk of inheriting or passing on a genetic disorder, offering options for family planning and reproductive choices.

4. Which of the following is NOT a common symptom of cystic fibrosis?

   1. Persistent cough
   2. Frequent lung infections
   3. Salty-tasting skin
   4. Muscle weakness
   Show answer

   Answer: D. Muscle weakness

   While cystic fibrosis can affect multiple systems, muscle weakness is not a typical symptom.

5. Explain how amniocentesis can be used in prenatal diagnosis of genetic disorders.

   1. Amniocentesis analyzes fetal DNA from maternal blood.
   2. Amniocentesis is a non-invasive procedure.
   3. Amniocentesis examines a sample of amniotic fluid surrounding the fetus.
   4. Amniocentesis directly examines fetal chromosomes in real time.
   Show answer

   Answer: C. Amniocentesis examines a sample of amniotic fluid surrounding the fetus.

   Amniocentesis involves extracting amniotic fluid that contains fetal cells, which can be analyzed for chromosomal abnormalities or genetic mutations.

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