I need 4 possible types of gene mutations?

Additions, deletions, substitutions, inversions...

There are different ways to classify different kinds of mutations, but here are a few:

1. Base substitution mutations--Changing 1 base into another

2. Insertion mutations--Adding 1 or more bases into a gene.

3. Deletion mutation--removing one or more bases from a gene.

4. Gene rearrangements--larger scale changes that move a gene from one place on a chromosome to another. There are several different kinds of these like translocations and inversions.

Hope this helps....

There are two types of such mutation:-

(1) Point mutation and (2) Frame-shift mutation.

From the point of view of actions and mechanisms they are subdivided as follows:-

(1) Point mutation:- (a) Transition (where a purine/pyrimidine replaced by another) and (b) Transversion (where a purine isreplaced by a pyrimidine and vice-versa).

(2) Frame-shift mutation:- (a) Insertion (where a base or base-pair is inserted into the DNA) and (b) Deletion (where a base or base-pair is deleted and no insertion occurs).

Thus collectively the types are-

(i) Transition.

(ii) Transversion.

(iii) Insertion.

(iv) Deletion.