Cytogenetics - Quiz
  • 1. Cytogenetics is a branch of genetics that deals with the study of chromosomes and their role in inheritance. It involves analyzing the structure, function, and numerical abnormalities of chromosomes to understand genetic diseases, birth defects, and other conditions. By studying the karyotype, or the complete set of chromosomes in an individual, cytogeneticists can identify chromosomal disorders such as Down syndrome, Turner syndrome, and Klinefelter syndrome. Techniques used in cytogenetics include karyotyping, fluorescent in situ hybridization (FISH), and array comparative genomic hybridization (aCGH). Cytogenetics plays a crucial role in prenatal screening, cancer diagnosis, and research on genetic disorders.

    Which laboratory technique is commonly used in cytogenetics?
A) Western blot
B) Karyotyping
C) ELISA
D) PCR
  • 2. What does a FISH analysis in cytogenetics involve?
A) Studying bacterial growth patterns
B) Using fluorescent probes to detect specific DNA sequences on chromosomes
C) Analyzing mutations in viruses
D) Determining protein expression levels
  • 3. Which condition is caused by aneuploidy of the sex chromosomes?
A) Down syndrome
B) Turner syndrome
C) Klinefelter syndrome
D) Trisomy 18
  • 4. What is the purpose of a G-banding stain in cytogenetics?
A) To study protein interactions
B) To identify genetic mutations
C) To detect viral DNA
D) To visualize and analyze chromosome structure
  • 5. Which of the following disorders is commonly diagnosed through cytogenetic testing?
A) Migraines
B) Asthma
C) Down syndrome
D) Type 2 diabetes
  • 6. What do telomeres represent in chromosome structure?
A) Regions of active gene expression
B) Markers for genetic disorders
C) Genetic material responsible for eye color
D) Protective caps at the ends of chromosomes
  • 7. Which type of aneuploidy is associated with an extra copy of the X chromosome in males?
A) Trisomy 18
B) Turner syndrome
C) Klinefelter syndrome
D) Down syndrome
  • 8. Why are metaphase chromosomes commonly used for karyotyping?
A) Chromosomes are inactive during metaphase
B) Metaphase is the phase when new chromosomes are formed
C) Chromosomes are condensed and easy to visualize
D) Metaphase is the only phase suitable for chromosome collection
  • 9. How does cytogenetic analysis contribute to cancer research?
A) Identifying chromosomal abnormalities associated with specific types of cancer
B) Detecting protein expression levels
C) Determining blood cell count
D) Studying bacterial growth patterns
  • 10. What is the function of a centromere on a chromosome?
A) It regulates gene expression
B) It contains genes responsible for eye color
C) It protects the ends of chromosomes
D) It is a region that mediates chromosome segregation during cell division
  • 11. In cytogenetics, what is the role of a probe?
A) To regulate gene expression
B) To bind to specific DNA sequences and identify chromosomal abnormalities
C) To induce genetic mutations
D) To alter protein structures
  • 12. What is the total number of chromosomes in a typical human karyotype?
A) 20
B) 48
C) 46
D) 23
  • 13. How does mosaicism differ from polyploidy?
A) Polyploidy affects only sex chromosomes
B) Polyploidy results in abnormal chromosomal numbers
C) Mosaicism involves cells with different genetic compositions in the same individual
D) Mosaicism is a type of gene mutation
  • 14. What is the term for the specific location of a gene on a chromosome?
A) Chromosome map
B) Allele
C) Locus
D) Codon
  • 15. What is the term for the loss of a whole chromosome?
A) Trisomy
B) Monosomy
C) Tetrasomy
D) Aneuploidy
  • 16. What can a structural chromosomal abnormality result from?
A) Viral infections
B) Protein synthesis errors
C) Bacterial mutations
D) Deletions, duplications, inversions, or translocations
  • 17. Which of the following is an abnormality involving the number of chromosomes?
A) Duplication
B) Translocation
C) Aneuploidy
D) Deletion
  • 18. During which phase of the cell cycle does chromosomal duplication occur?
A) S phase
B) G1 phase
C) G2 phase
D) M phase
  • 19. What is the term for the appearance of an individual based on genetic makeup and environmental factors?
A) Phenotype.
B) Allele.
C) Genotype.
D) Karyotype.
  • 20. Which type of chromosomal abnormality involves a piece of a chromosome breaking off and reattaching upside down?
A) Translocation
B) Inversion
C) Duplication
D) Deletion
  • 21. Which disorder is associated with a chromosomal deletion on the 15th chromosome?
A) Prader-Willi syndrome
B) Huntington's disease
C) Cri du chat syndrome
D) Marfan syndrome
  • 22. Which chromosomal abnormality involves the exchange of genetic material between nonhomologous chromosomes?
A) Deletion
B) Translocation
C) Duplication
D) Inversion
  • 23. What is the haploid number of chromosomes in humans?
A) 24
B) 46
C) 23
D) 22
  • 24. What type of chromosomal abnormality involves the repetition of a segment of DNA multiple times within a chromosome?
A) Deletion
B) Inversion
C) Translocation
D) Duplication
  • 25. How many autosomes do normal human somatic cells contain?
A) 46
B) 22
C) 44
D) 24
  • 26. What term describes a normal pairing of homologous chromosomes during meiosis?
A) Synapsis
B) Aneuploidy
C) Translocation
D) Crossing over
  • 27. Which technique is used to visualize banding patterns on chromosomes?
A) G-banding
B) Flow cytometry
C) Immunofluorescence
D) X-ray crystallography
  • 28. Which of the following structures holds sister chromatids together?
A) Centromere
B) Gene
C) Telomere
D) Nucleolus
  • 29. What is the Philadelphia chromosome associated with?
A) Parkinson's disease.
B) Breast cancer.
C) Cystic fibrosis.
D) Chronic myeloid leukemia.
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