Final answer:
Mitochondrial DNA is useful in identifying remains by allowing us to trace genealogy. It is passed on from mother to offspring and contains unique genetic information. By comparing the mtDNA of remains with known maternal relatives, scientists can identify individuals.
Step-by-step explanation:
Mitochondrial DNA (mtDNA) is helpful in identifying remains because it is passed on from mother to offspring, allowing us to trace genealogy. Mitochondria contain their own DNA, which mutates at a rapid rate, making it useful for studying evolutionary relationships. The lack of recombination in mtDNA means that the child has exactly the same mitochondrial genes as its female genetic contributor. This enables scientists to compare the mtDNA of remains with that of known maternal relatives to identify individuals.