$A$ mutation from the wild type to a new type is called:

The defect sickle-cell anaemia is caused by the . . . . . . of glutamic acid by valine at the $6^{th}$ position of the . . . . . . globin chain of the haemoglobin molecule.

The locus of a mutation is .....

Explain frame-shift mutation.

What arises due to errors in $DNA$ replication?

In a mutational event,when adenine is replaced by guanine,it is called: