Match the columns :

Column $I$
 
Column $II$
 
$(1)$ Lethal mutation $(a)$ Mutation caused by
external factors
$(2)$ Spontaneous mutation $(b)$ They are metabolic
errors
$(3)$ Induced mutation $(c)$ As a result the
mutant dies
$(4)$ Biochemical mutation $(d)$ Most of the
mutations occurs in
nature are of this
type.
 

 

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$(1-c),( 2-d), (3-a), ( 4-b)$

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