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

  • 1. 
    A true hybrid condition is:

  • tt Rr
  • Tt rr
  • tt rr
  • Tt Rr

  • 2. 
    The allele which is unable to express its effect in the presence of another is called :

  • Co-dominant
  • Supplementary
  • Complementary
  • Recessive

  • 3. 
    Most of the mutations are:

  • Recessive
  • Harmful
  • Germinal
  • All of these

  • 4. 
    Smallest segment of genetic material affected by mutation is :

  • Recon
  • Cistron
  • Muton
  • Exon

  • 5. 
    Genes located on V-chroinosome are:

  • Mutant genes
  • Autosomal genes
  • Holandric genes
  • Sex-linked genes

  • 6. 
    A strong mutagen is:

  • Cold
  • Heat
  • Water
  • X-rays

  • 7. 
    A point mutation is:

  • Thalassemia
  • Sickel-cell anaemia
  • Down’s syndrome
  • Nightblindness

  • 8. 
    Mendel’s second law is of the law of:

  • Segregation
  • Dominance
  • Polygenic inheritance
  • Independent assortment

  • 9. 
    An organism with two unlike genes of a trait is called :

  • Homozygous
  • Hetrozygous
  • Both of these
  • None of these

  • 10. 
    Mendel’s laws were discovered by:

  • Correns
  • Shermak
  • de meris
  • All of these
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