Males possess one Y and one X chromosome while females have two X chromosomes, with some exceptions.
But until now, the Y chromosome part of the human genome had contained big gaps.
In addition to identifying some additional Y chromosome genes, the researchers found that some DNA from the chromosome had been mistaken in previous studies as bacterial in nature.
The first complete human genome - albeit with the Y chromosome partial - was published last year.
Fully sequencing the Y chromosome adds to this.
Persons:
Karen Miga, Carolyn Lagattuta, Arang Rhie, Monika Cechova, Cechova, Will Dunham, Rosalba O'Brien
Organizations:
University of California, UC Santa Cruz, REUTERS, Rights, Wednesday, U.S ., Genome Research, of California, UCSC, Thomson
Locations:
Santa Cruz , California, U.S, Handout, Santa Cruz