DNA microinjection is one of the techniques of creating genetically modified animals. This involves choosing a set of genes or a single gene from another animal that can be of the same species or from a different species. The genes identified are those which lead to the expression of characteristics not found naturally in the subject animal.
The genes are then inserted into the fertilized ovum of the animal. Due to the inserted gene there can be a reduced or enhanced expression of genes that exist in the animal naturally or due of the genes that are being introduced into the ovum.
After the microinjection procedure the modified ovum is transferred for further growth into a female of the same species. The resulting offspring is expected to show the characteristics for which it has been genetically modified.