Mutations caused by mutagenic agents are termed as

In the case of a mutation,when guanine replaces adenine,it is known as:

The locus of a mutation is .....

The following diagram shows two chromosomes and the letters represent the genes.
Chromosome $1$:

$P$

$Q$

$R$

$S$

$T$

$U$

$V$

$W$

Chromosome $2$:

$E$

$F$

$G$

$H$

Which of the following would result if a translocation occurred between chromosome $1$ and $2$?

In a mutational event,when adenine is replaced by guanine,it is a case of

What is the cause of mutation?