DYS is short for
DNA
Y-chromosome
Segment, and is used to designate a segment of
DNA on the
Y chromosome where a sequence of
nucleotides repeats. These sequences are known as
short tandem repeats (STRs), and are called
markers in
genealogical DNA testing. The possible variations of repeats at a DYS marker are known as
alleles.
Some testing companies have different formats for the way DYS markers are written, for example, the location 455 may be written as DYS455, DYS 455, DYS#455, or DYS# 455.
See also
External links
