3. 2 Alignment of pairs of sequences The most basic sequence analysis task is to ask if two sequences are related This is usually done by first aligning the sequences(or parts of them) and deciding whether that alignment is more likely to have occurred because the sequences are related, or just by chance Sequence alignment is the procedure of comparing two(pairwise alignment or more(multiple sequence alignment) sequences by searching for a series of individual characters or character patterns that in the same order in the sequences3.2 Alignment of Pairs of Sequences • The most basic sequence analysis task is to ask if two sequences are related. • This is usually done by first aligning the sequences (or parts of them) and deciding whether that alignment is more likely to have occurred because the sequences are related, or just by chance. • Sequence alignment is the procedure of comparing two (pairwise alignment) or more (multiple sequence alignment) sequences by searching for a series of individual characters or character patterns that in the same order in the sequences