Download PTU B.Sc-Agriculture 2020 March 3rd Sem 72554 Introduction To Genetics Question Paper

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Roll No. [ ] Total No. of Pages : 02

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.

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3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Define or briefly describe the following :
   1. Transversion
   2. Turner’s syndrome
   3. Polytene chromosomes

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   4. Lamp brush chromosomes
   5. B-DNA
   6. Synaptonemal complex
   7. Frameshift mutation
   8. Lethal gene

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   9. Nucleosome
   10. XXXY condition

SECTION-B

Differentiate between :

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2. Penetrance and Expressivity
3. Sex linked and Sex limited Traits
4. Inducible and Repressible operon
5. Physical mutagens and Chemical mutagens
6. Paracentric inversion and Pericentric inversion

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SECTION-C

6. Discuss in detail the process of translation (draw neat and well labeled diagram). Also discuss the characteristic features of genetic code.
7. a) Prove that DNA is a genetic material by citing a suitable experimental evidence.
   b) Explain cytoplasmic inheritance with suitable examples (any two).
8. a) Discuss the evolutionary history of cotton.
   

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   b) Explain the mechanisms (any two) of crossing over.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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