>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






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>Answer any ten of the following questions : 2x10=20 >






  1. >What is meant by codominance? Cite one example? >


  2. >What is testcross? Differentiate it from back Cross. >


  3. >What are lethal alleles? Cite one example of lethal allelic trait in
    human.? >


  4. >What is crossing-over? >


  5. >What is interference in gene mapping? >


  6. >State the chromosome theory of linkage. >


  7. >What is frameshift mutation and what gre its consequences? >


  8. >Differentiate = between Euploidy and Aneuploidy. >


  9. >Differentiate between Trisomy and Tetrasomy. Name two trisomic
    chromosomal disorders. >


  10. >What is Barr body? >


  11. >What is heterogamesis? >


  12. >How is sex determined in man? >


  13. >What is meant by polygenic inheritance? >


  14. >What is transduction? >


  15. >Differentiate between Episomes and Plasmids. >





SECTION-B 6x5=30






  1. >State Mendel's law of independent assortment. Explain the law with a
    suitable illustration. Explain what is Pleiotropism.? 1+3+2=6 >


  2. >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 >


  3. >Discuss the phenomenon of linkage citing ‘Suitable examples. What is
    meant by linkage group? : 4+2=6 >


  4. >Write short notes on cytological basis of crossing over and linkage map.
    3+3=6 >


  5. >Define gene mutation. Discuss molecular basis of mutations in relation to
    UV light and chemical mutagens. What is tautomerisation? 1+4+1=6 >


  6. >Write short notes on types of gene mutation and polyploidy. 3+3=6 >


  7. >Describe genic balance mechanism of sex determination in animals. Add a
    note on environmentally controlled sex determining mechanism with suitable
    examples. 4+2=6 >


  8. >Discuss extra-nuclear maternal inheritance in eukaryotes with suitable
    examples. Add a note on mitochondria. extra-nuclear inheritance by
    mitochondria 4+2=6 >


  9. >What are transposable genes and what are their characteristics? Briefly
    transposons in human. discuss 1+2+3=6 >


  10. >Write short notes on transformation and transduction transfer. as
    mechanisms of gene 3+3=6 >