Hugo de Vries formulated the “Mutation Theory'' based on the experiments he conducted on

  • A

    Althea rosea

  • B

    Pisum sativum

  • C

    Drosophila melanogaster

  • D

    Oenothera lamarckiana

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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.