Identify the type of mutation in the given diagram.

Which is not possible by mutation?

The gene which increases the frequency of mutation in other gene is referred to as

Assertion $(A)$: Mutation results in changes in genotype and phenotype of an organism.
Reason $(R)$: Mutation leads to alteration of $\text{DNA}$ sequences,i.e.,variations in $\text{DNA}$.
Choose the correct answer from the options given below.

Normally $DNA$ molecule has $A-T$ and $G-C$ pairing. However,these bases can exist in alternative valency status,owing to rearrangements called:

The use of an atomic bomb leads to abnormalities in the coming generations due to: