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Questions  >>  CBSE XII  >>  Biology

How does a mutagen induce mutation? Explain with an example.

How does a mutagen induce mutation? Explain with an example.

1 Answer

Mutagen changes the alignment and composition of nitrogenous bases of DNA that results in changed product of the gene. For example, nitrous acid is a common industrial chemical, deaminates  cytocin to uracil,  guanine to xanthine and adenine to hypoxanthine . It changes A-T base pair to H-C, C-G base pair with U-A and C-x. Such base pairs get either eliminated or replaced with others causing a change in the gene expression.
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