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Botany - Classical Genetics Practice Question Paper

12th Standard EM

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Biology

Time : 01:00:00 Hrs
Total Marks : 40
    7 x 1 = 7
  1. In Mendel’s experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?

    (a)

    Only round seeds with green cotyledons

    (b)

    Only wrinkled seeds with yellow cotyledons

    (c)

    Only wrinkled seeds with green cotyledons

    (d)

    Round seeds with yellow cotyledons an wrinkled seeds with yellow cotyledons

  2. Gene which suppresses other genes activity but does not lie on the same locus is called as

    (a)

    Epistatic

    (b)

    Supplement only

    (c)

    Hypostatic

    (d)

    Codominant

  3. Which is not a correct statement?
    (A) Variations are the raw materials for evolution
    (B) Variations provide genetic material for natural selection
    (C) It helps the individual to adapt to the changing environment
    (D) Variations allow breeders to improve the crop field

    (a)

    A and D

    (b)

    B only

    (c)

    C and D

    (d)

    none of he above

  4. How many characters studied by Mendel in pisum sativum

    (a)

    Three

    (b)

    Five

    (c)

    Seven

    (d)

    Nine

  5. Identify the incorrect statement

    (a)

    In incomplete dominance, the traits are blended not the genes

    (b)

    Incomplete dominance is noticed in Mirabilis jalapa by Carl Correns

    (c)

    It is a type of Intragenic gene interaction

    (d)

    Incomplete dominance F2 ratio is 1 : 3 : 1

  6. Identify the allelic interaction

    (a)

    Dominant epistasis

    (b)

    Co-dominance

    (c)

    Recessive epistasis

    (d)

    Duplicate genes

  7. The 1 : 2 : 1 ratio of co-dominance process Mendel's ___________

    (a)

    Law of dominance

    (b)

    Law of recessiveness

    (c)

    Law of segregation

    (d)

    Law of independent assortment

  8. 1 x 1 = 1
  9. The process of removal of anthers from the flower is called ________

    ()

    Emasculation

  10. 5 x 2 = 10
  11. What is back cross?

  12. Name any four characters of pisum sativum that was studied by Mendel.

  13. State the law of independent assortment.

  14. In which plant does the incomplete dominance was studied by Carl Correns? Write the ratio of the cross.

  15. What is cytoplasmic male sterility?

  16. 4 x 3 = 12
  17. Explain the law of dominance in monohybrid cross.

  18. How many types of gametes are produced by heterozygous dihybrid plant with a genotype RrYy? Write them.

  19. In the chart given below, 'AA' are the genes located in a chromosome of Pisum sativum.
    Observe the chart and mention the genetic phenomenon does it indicates.

  20. Name the respective pattern of inheritance where F 1phenotype
    a) resembles anyone of the two parents
    b) is an intermediate between two parental traits.

  21. 2 x 5 = 10
  22. Explain with an example how single genes affect multiple traits and alleles the phenotype of an organism.

  23. Describe incomplete dominance exhibited by Mirabilis jalapa.

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