DNA profiling relies on an individual's ________, no two of which are the same between different people, except identical twins.

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DNA profiling uses short tandem repeats (STRs) within DNA, which are repeated sequences of nucleotides. The number of repeats at specific STR locations is different for each person, except for identical twins who have the same DNA. Therefore, a person's STR profile can be used to identify them uniquely. Gene sequences (A) and mRNA sequences (B) can vary between individuals, but they are not as unique as DNA STR profiles. Fingerprints (D) are also unique to individuals, but they are not as reliable for identification purposes as DNA profiling.

DNA Profiling Relies on an Individual's ________, No Two of Which