Question

how does the process of modifying an organisms dna typically begin? by identifying the specific gene or genes of interest by breeding different organisms together by introducing a mutation into an organisms dna

Explanation:

When modifying an organism's DNA, the first step is to identify the specific gene or genes of interest. Breeding different organisms together is a traditional method (not the start of DNA - modification in the molecular sense). Introducing a mutation is part of the later process (after the gene of interest is identified).

Answer:

by identifying the specific gene or genes of interest