2021 /TDC/CBCS/ODD/ ZOOHCC-502T/034 Question Paper
TDC (CBCS) Odd Semester Exam., 2021 held in March, 2022
ZOOLOGY ( 5th Semester ) Course No. : ZOOHCC-502T
( Principles of Genetics )
SECTION—A
Answer any ten of the following questions : 2x10=20
- What is meant by codominance? Cite one example?
- What is testcross? Differentiate it from back Cross.
- What are lethal alleles? Cite one example of lethal allelic trait in human.?
- What is crossing-over?
- What is interference in gene mapping?
- State the chromosome theory of linkage.
- What is frameshift mutation and what gre its consequences?
- Differentiate = between Euploidy and Aneuploidy.
- Differentiate between Trisomy and Tetrasomy. Name two trisomic chromosomal disorders.
- What is Barr body?
- What is heterogamesis?
- How is sex determined in man?
- What is meant by polygenic inheritance?
- What is transduction?
- Differentiate between Episomes and Plasmids.
SECTION-B 6x5=30
- State Mendel's law of independent assortment. Explain the law with a suitable illustration. Explain what is Pleiotropism.? 1+3+2=6
- What is meant by sex-linked inheritance? Discuss characteristic pattern of sex-linked inheritance with suitable examples. Differentiate between sex-influenced and sex-limited genes. 1+4+1=6
- Discuss the phenomenon of linkage citing ‘Suitable examples. What is meant by linkage group? : 4+2=6
- Write short notes on cytological basis of crossing over and linkage map. 3+3=6
- Define gene mutation. Discuss molecular basis of mutations in relation to UV light and chemical mutagens. What is tautomerisation? 1+4+1=6
- Write short notes on types of gene mutation and polyploidy. 3+3=6
- Describe genic balance mechanism of sex determination in animals. Add a note on environmentally controlled sex determining mechanism with suitable examples. 4+2=6
- Discuss extra-nuclear maternal inheritance in eukaryotes with suitable examples. Add a note on mitochondria. extra-nuclear inheritance by mitochondria 4+2=6
- What are transposable genes and what are their characteristics? Briefly transposons in human. discuss 1+2+3=6
- Write short notes on transformation and transduction transfer. as mechanisms of gene 3+3=6
