Loyola College B.Sc. Plant Biology and Biotechnology Nov 2006 Genetics And Plant Breeding Question Paper PDF Download

             LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & BIOTECHNOLOGY

AE 13

FIFTH SEMESTER – NOV 2006

PB 5506 – GENETICS AND PLANT BREEDING

 

 

Date & Time : 01-11-2006/9.00-12.00         Dept. No.                                                       Max. : 100 Marks

 

 

 

 

Part A                                           (20 marks)

Answer All questions

 

I Choose the Correct Answer                                                                     ( 5 x 1 = 5 marks)

 

01.The nucleic acid was first isolated from the nuclei of pus cells by

  1. Freidrich Miesher b. W.T. Astbury
  2. Wilkins d. F.G. Banting

 

  1. The partial expression of both alleles in a heterozygote so that the phenotype is

intermediate between those of the two homozygotes is

  1. dominance b. incomplete dominance
  2. pleotropism d. independent assortment

 

  1. Genetic code determines
  2. constancy of morphological traits b. structural pattern of organism
  3. sequence of aminoacids in a protein sequence of nucleotides in a protein

 

  1. Which of the following represents Klinefelters syndrome ?
  2. XX b. XO              c. XYY           d.  XXY

 

  1. Mutation was proposed as a theory for the operative mechanism of evolution by
  2. Charles Darwin b.  Louis Pasteur
  3. Francisco Redi d.  Hugo de Vries

 

II State whether the following statements are  True or False    ( 5 x 1 = 5 marks)

  1. Individuals with a dominant lethal gene die before they can reproduce.
  2. The sequence of nucleotide bases in the mRNA is complementary to the template

DNA strand.

  1. The regulatory gene of trp operon constitutively synthesizes a non- functional protein

called co- repressor.

  1. Down syndrome is the result of twenty first chromosome present in three doses.
  2. The cross between the parents belonging to two different species of the same genus

is called intraspecific hybridization.

 

 

 

 

III. Complete the following                                                                     ( 5 x 1 = 5 marks)

  1. The condition in which one member of an allelic pair is manifested to the exclusion

of  the other——————-.

12     ________ enzymes are capable of catalyzing phosphodiester bond formation.

13    The __________ gene  marks the site at which transcription of mRNA  starts.

14     The second correction system  for correcting the occasional error missed by the

editing function is called _______ repair.

15     The use and disuse principle of evolution was proposed by _______.

 

  1. Answer all, each in about 50 words ( 5 x 1 = 5 marks)

 

  1. Define codominance.
  2. Distinguish between A DNA and Z DNA.
  3. What is poly A tail ?.
  4. Write the mode of action of alkylating agents.
  5. What is pureline selection ?.

 

PART B                                     ( 5 x 8 = 40 marks)

Answer any five, each within 350 words only. Draw diagrams and flowcharts wherever necessary.

 

  1. What is quantitative inheritance? Briefly explain this with suitable example.
  2. Describe the structure and organization of a gene.
  3. Explain the structural organization of a chromosome.
  4. Write a brief note on the features of genetic code.
  5. Give a brief account on common defects in DNA and their origins.
  6. What is klinefelter’s syndrome ?. Add a note on its symptoms and related findings.
  7. Define mass selection. Briefly describe the procedure of mass selection and discuss

its merits and demerits.

  1. Give a brief account of Darwin’s theory of natural selection.

 

 

PART C                                    ( 2 x 20 = 40 marks)

 

Answer the following, each within 1500 words only. Draw diagrams and flowcharts wherever necessary.

 

  1. (a) Write an essay on sex determination in plants.

OR

(b)  i. Give an account of supercoiling of DNA.

  1. Discuss :    ‘DNA is the genetic material’.

 

  1. (a) Describe the following with suitable examples.
  2. Genetic recombination using tetrad analysis.
  3. Transposable elements in plants.

OR

(b)  Write an essay on different types of chromosomal aberrations.

 

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