Mutations are responsible for

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

How are point mutations and deletion mutations related to the genetic code?

Define/Explain the following terms:
$1.$ Mutation
$2.$ Alleles

Which phenomenon leads to the variation in $DNA$?

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 $2$?