True. If a BLAST result show 100% coverage and 97% identity the sequences are from closely related individuals.
BLAST - Basic Local Alignment Search Tool
In biological sequences, BLAST looks for areas of similarity. The software determines the statistical significance by comparing protein or nucleotide sequences to sequence databases. Using a substitution matrix, the query is compared to words of length "W" that score at least "T" in the initial search. In an effort to produce an alignment with a score higher than the "S" criterion, word hits are then stretched in either direction. The "T" option controls the search's sensitivity and speed.
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