CBSE  /  Class 12  /  Biology  /  Principles of Inheritance and Variation

  • 1. 
    When F

  • Dominance
  • Blended inheritance
  • Law of segregation
  • Law of independent assortment

  • 2. 
    Mendel’s formulated the law of purity of gametes on the basis of:

  • Test cross
  • Back cross
  • Monohybrid cross
  • Dihybrid cross

  • 3. 
    tt mates with Tt. What will be characteristic of offspring:

  • 75% Ineffective
  • 50% Uneffective
  • 25% Uneffective
  • All Effective

  • 4. 
    Failure of segregation of chromatids during cell division Cycle result in the gain or loss of a cromosome (s) is called :

  • Female heterogamety
  • Male heterogamety
  • Aneuploidy
  • None of these

  • 5. 
    Exception of Mendel’s law is:

  • Dominance
  • Purity of gametes
  • Linkage
  • Independent assortment

  • 6. 
    Haemophilia is a:

  • Mendelian disorder
  • Chromosomal disorder
  • Can be (a) or (b)
  • None of these

  • 7. 
    Down’s syndrome is a:

  • Mendelian disorder
  • Chromosomal disorder
  • can be both
  • None of these

  • 8. 
    Mendel worked on :

  • Edible pea
  • Wild pea
  • Garden Pea
  • None of these

  • 9. 
    A gamete contains which of the following :

  • Both alleles of a gene
  • Only one allele of a gene
  • Al allele of a gene
  • No allele

  • 10. 
    Name the scientist who discovered the law of Heredity :

  • Gregor Mendel
  • Newton
  • Piinnett
  • None of these
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