Assertion (a) :- An organism with lethal mutation may not even develop beyond the zygote stage.
Reason (R ) :- All types of gene mutations are lethal .

Assertion: During mutation a gene may undergo a sudden change in expression due to the change in composition. Reason: Some genes mutate more than one and have more than two alleles.

Assertion (A) : Parthenocarpy which arises due to mutation is called genetic parthenocarpy. Reason (R ) : Seedless fruits are useful for the preparation of jams.

Assertion (A): Inactive stage in the cell cycle is quiescent stage. Reason (R ): All the cells pass through quies cent stage.

Assertion : A single mutation may produce a new species . Reason : Mutation may cause major variation in genetic material and these are inheritable .

Assertion : A single mutation may produce a new species . Reason : Mutation may cause major variation in genetic material and these are inheritable .

Assertion : A single mutation may produce a new species . Reason : Mutation may cause major variation in genetic material and these are inheritable .

Assertion : A single mutation may produce a new species . Reason : Mutation may cause major variation in genetic material and these are inheritable .

Assertion (A): Speciation is the process of formation of a new species from a pre-existing one. Reason (R): Mutation plays a role in speciation