GPB - 502 (2+1): Principles of Cytogenetics

 

COLLEGE OF AGRICULTURAL SCIENCES, RAICHUR

GPB - 502 (2+1): Principles of Cytogenetics
Announced Quiz

Time: 1 hour
Max. Marks: 15

---

Q.I. Define / Answer briefly (5 × 1 = 5 Marks)

1. Episomes

2. Telomere

3. Cot Value

4. C-value paradox

5. Hyperchromaticity

---

Q.II. Fill in the blanks (0.5 × 10 = 5 Marks)

1. Somatic cells carry diploid set of chromosomes.

2. If the hexaploid organism has 42 chromosomes, then haploid and basic chromosome number is 21 and 7 respectively.

3. Nucleolus is clonally inherited to two daughter cells.

4. Polytene chromosomes are produced by karyokinesis without cytokinesis (endoduplication).

5. Chromosomes are made up of DNA and histone proteins.

6. B-chromosomes never pair with normal A-chromosomes, hence follow non-Mendelian inheritance.

7. Centromeric activity is diffused in holocentric chromosomes.

---

Q.III. Match the Scientists’ names with their discoveries/contributions (10 × 0.5 = 5 Marks)

Block A	Block B
Waldeyar	9. Chromosomes
Balbiani	6. Polytene chromosomes
Ruckerts	3. Meiotically unstable
Ring chromosomes	4. Low transcription rate (40 bp/s)
Iso-chromosomes	1. Similar chromosome arms
Sutton and Boveri	2. Chromosomal theory of inheritance
Robert Brown	10. Nucleus
Prokaryotes	8. Coined 'cell' term
Watson and Crick	12. DNA discovery
H.J. Muller	11. X-ray induced mutations

---

Best of luck!