Today (or perhaps yesterday?) popular DIY genomics website GEDmatch.com released a new tool for phasing DNA data. Listed under a link entitled “Generate phased data file,” the tool allows users of the GEDmatch.com site to phase their chromosomes if they have their parent’s raw data.
(A similar tool was previously created by David Pike at http://www.math.mun.ca/~dapike/FF23utils/; with David’s tool, users receive their results directly and do not need to upload their DNA test results; accordingly, users have a variety of options depending on their privacy tolerance).
What the Heck is “Phasing”?
Currently, SNP chip testing performed by 23andMe or Family Tree DNA is unable to attribute a test result to either one of your parents. For example, if your results for SNP rs00000 are “AG,” the test alone cannot determine whether the “A” came from your mother or father.