Final answer:
DNA sequence data is analyzed by comparing it with existing sequences in databases and using computational tools to align and analyze the sequences. This helps determine sequence identity, evolutionary distance, and construct phylogenetic trees.
Step-by-step explanation:
DNA sequence data is analyzed by comparing the sequences with existing sequences in databases such as GenBank. Computational tools are used to align and analyze the sequences, determining the percentage of sequence identity or homology. DNA analysis can be used to estimate the evolutionary distance between sequences and to construct phylogenetic trees.