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Botany - Chromosomal Basis of Inheritance Practice Question Paper

12th Standard EM

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Biology

Time : 01:00:00 Hrs
Total Marks : 40
    7 x 1 = 7
  1. Which of the following sentences are correct?
    1. The offspring exhibit only parental combinations due to incomplete linkage
    2. The linked genes exhibit some crossing over in complete linkage
    3. The separation of two linked genes are possible in incomplete linkage
    4. Crossing over is absent in complete linkage

    (a)

    1 and 2

    (b)

    2 and 3

    (c)

    3 and 4

    (d)

    1 and 4

  2. How many map units separate two alleles A and B if the recombination frequency is 0.09?

    (a)

    900 cM

    (b)

    90 cM

    (c)

    9 cM

    (d)

    0.9 cM

  3. Which is not a feature of the chromosomal theory of inheritance?

    (a)

    Somatic cells of organisms are derived from zygote by repeated meiosis.

    (b)

    Chromosomes retain their structural uniqueness throughout the life of an organism.

    (c)

    Mendelian factors are located in chromosomes

    (d)

    Sutton and Boveri independently proposed the theory.

  4. Mechanism of crossing over involves the following stages. Select the correct sequence.

    (a)

    Tetrad stage ~ Synapsis ~ Bivalent stage ~ cross over

    (b)

    Syndesis ~ Tetrad ~ Crossing over ~ Terminalisation

    (c)

    Terminalisation ~ Tetrad ~ Bivalent ~ Cross over

    (d)

    Cross over ~ Bivalent ~ Tetrad ~ Terminalisation

  5. Transition type of gene mutation is caused when__________

    (a)

    AC is replaced by GT

    (b)

    AG is replaced by TC

    (c)

    AC is replaced by TG

    (d)

    TC is replaced by AG

  6. One of the following is not the kind of euploidy

    (a)

    Diploidy

    (b)

    Polyploidy

    (c)

    Hyperploidy

    (d)

    Autoploidy

  7. Observe the gene sequence and identify the types of aberration ABC BCD E F?

    (a)

    Tandem duplication

    (b)

    Simple duplication

    (c)

    Reverse tandem duplication

    (d)

    Displaced tandem duplication

  8. 1 x 1 = 1
  9. Sex determination in plants was first discovered by___________

    ()

    C.E. Allen

  10. 5 x 2 = 10
  11. If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F1 hybrid. Now you cross F1 male with double recessive female.
    i) What type of linkage is seen?
    ii) Draw the cross with correct genotype.
    iii) What is the possible genotype in F2 generation?

  12. Define linkage. Mention its types.

  13. What are bivalents? When does this condition is noticed in a cell?

  14. How Sharbati Sonora was developed by Dr. M.S. Swaminathan et. al?

  15. What are deficiency loops?

  16. 4 x 3 = 12
  17. Explain the mechanism of crossing over.

  18. How and where chiasma is formed?

  19. Explain co-mutagens with examples.

  20. In Drosophila melanogaster, there are four pairs of chromosomes. If there occurs chromosomal aberrations resulting in trisomic and monnsomlc condition, what will be the chromosomal count? Write the correct chromosomal count against respective chromosomal aberration.

  21. 2 x 5 = 10
  22. What is gene mapping? Write its uses

  23. List out the significance of ploidy.

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