Discussion
Which locus is used for determining both male and female gender in DNA fingerprinting ?
Answer: C
The locus used to determine both male and female gender in DNA fingerprinting is amelogenin. The amelogenin gene is on both X and Y chromosomes, in a form that gives a different fragment size on each, so a female gives a single X band and a male gives both X and Y bands. DYS19 and DYS393 are loci on the Y chromosome only, so they give a result only for a male, and a Y-plex ladder is a size marker, not a locus. Option C is correct.
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