Botany - Chromosomal Basis of Inheritance Book Back Questions

12th Standard EM

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Biology

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. An allohexaploidy contains

    (a)

    Six different genomes

    (b)

    Six copies of three different genomes

    (c)

    Two copies of three different genomes

    (d)

    Six copies of one genome

  2. The A and B genes are 10 cM apart on a chromosome. If an AB/ab heterozygote is testcrossed to ab/ab, how many of each progeny class would you expect out of 100 total progeny?

    (a)

    25 AB, 25 ab, 25 Ab, 25 aB

    (b)

    10 AB, 10 ab

    (c)

    45 AB, 45 ab

    (d)

    45 AB, 45 ab, 5 Ab, 5aB

  3. Accurate mapping of genes can be done by three point test cross because increases

    (a)

    Possibility of single cross over

    (b)

    Possibility of double cross over

    (c)

    Possibility of multiple cross over

    (d)

    Possibility of recombination frequency

  4. If haploid number in a cell is 18. The double monosomic and trisomic number will be

    (a)

    35 and 37

    (b)

    34 and 37

    (c)

    37 and 35

    (d)

    17 and 19

  5. Changing the codon AGC to AGA represents

    (a)

    mis-sense mutation

    (b)

    non-sense mutation

    (c)

    frameshift mutation

    (d)

    deletion mutation

  6. 3 x 2 = 6
  7. When two different genes came from same parent they tend to remain together.
    i) What is the name of this phenomenon?
    ii) Draw the cross with suitable example.
    iii) Write the observed phenotypic ratio.

  8. s.no gamete types Number of progenies
    1 ABC 349
    2 Abc 114
    3 abC 124
    4 AbC 5
    5 aBc 4
    6 aBC 116
    7 ABc 128
    8 abc 360

    i) What is the name of this test cross?
    ii) How will you construct gene mapping from the above given data?
    iii) Find out the correct order of genes.

  9. What is the difference between missense and nonsense mutation?

  10. 3 x 3 = 9
  11. Write the salient features of Sutton and Boveri concept.

  12. Explain the mechanism of crossing over.

  13. Write the steps involved in molecular mechanism of DNA recombination with diagram.

  14. 2 x 5 = 10
  15. How is Nicotiana exhibit self-incompatibility. Explain its mechanism.

  16. How sex is determined in monoecious plants. write their genes involved in it.

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