Question

How does genetic mutation arise ?

Answer 1

Answer:

Genetic mutation arise by the addition and deletion of base sequence from DNA,by exposure of DNA to ultraviolet radiation,by treating DNA with various chemical such as 5 bromouracil,nitrous acid,arcidine orange etc

Explanation:

Addition or deletion of base sequence

mutation occur due to addition or deletion of base sequence to or from a DNA molecule.This ultimately result in changing the open reading frame.This ultimately lead to the production of defective protein

Exposure of DNA to ultraviolet Radiation

When DNA is exposed to ultraviolet ray a cyclobutane ring of tymidine dimer is formed which leads to genetic mutation

Treatment of DNA by Arcidine orange

Arcidine act as intercalating agent which get inserted between the adjacent base pairs resulting in genetic mutation