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STD 12 - 4. principal of inheritance and variation — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
Mutation caused by a mutagen is
  • A
    Natural
  • B
    Chemical
  • C
    Spontaneous
  • ✓
    Induced
✓

Answer

Correct option: D.
Induced
d
(d)1) Induced mutations are alterations in the gene after it has come in contact with mutagens and environmental causes. Mutagens can be chemical(nitrous acid), radiations(x-ray) etc.2) A mutation which occurs by itself without first being affected by a mutagen, for example during the process of DNA replication. 3) Mutation-induced by chemicals such as Nitrous acid is called chemical mutation. 4) Spontaneous mutations are the mutations that are a result of natural changes in DNA structure.

 
 

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