Complementary DNA Complementary DNA DNA DNA DNA Polymerase DNA Polymerase Directionality (molecular Biology) Directionality (molecular Biology) Exon Exon Genetic Fingerprinting Genetic Fingerprinting Genetic Marker Genetic Marker Intron Intron Junk DNA Junk DNA Sense (molecular Biology) Sense (molecular Biology) Single Nucleotide Polymorphism Single Nucleotide Polymorphism