Go Back   Family Tree DNA Forums > Universal Lineage Testing (Autosomal DNA) > Family Finder Advanced Topics

Family Finder Advanced Topics Advanced discussion about Family Tree DNA's Family Finder Product.

Reply
 
Thread Tools Display Modes
  #1  
Old 23rd January 2015, 02:04 PM
Kathy Johnston Kathy Johnston is offline
Junior Moderator
 
Join Date: Jul 2006
Posts: 218
Blog Entries: 2
Segment Matches with Grandparents Using Crossover Lines

Many have asked for some suggestions for strategies used in the visual phasing of grandparents when parents are deceased. I put together a step-by-step PDF file from a PowerPoint presentation. It utilizes crossover points derived from comparisons through GEDmatch. I can explain each step once the slides load. I have permission from this family to discuss the results. The ultimate goal is to show matching between siblings and each set of grandparents for one chromosome.
Reply With Quote
  #2  
Old 23rd January 2015, 04:07 PM
Kathy Johnston Kathy Johnston is offline
Junior Moderator
 
Join Date: Jul 2006
Posts: 218
Blog Entries: 2
Quote:
Originally Posted by Kathy Johnston View Post
Many have asked for some suggestions for strategies used in the visual phasing of grandparents when parents are deceased. I put together a step-by-step PDF file from a PowerPoint presentation. It utilizes crossover points derived from comparisons through GEDmatch. I can explain each step once the slides load. I have permission from this family to discuss the results. The ultimate goal is to show matching between siblings and each set of grandparents for one chromosome.
Here are the instructions that go with the slides. I wasn't sure I could get it all in one upload. I guess it is really the phasing of siblings (not the grandparents) to determine the segments that came from each of the grandparents. It is basically just triangulating your segments back to your grandparents by using sibling matches. I have found it to be quite useful. Suggestions are welcome.
Reply With Quote
  #3  
Old 25th January 2015, 02:55 PM
Canyon Wolf Canyon Wolf is offline
FTDNA Customer
 
Join Date: Feb 2014
Posts: 52
Thumbs up Great Help with phasing

Kathy, once again you have been extremely helpful with my understanding of phasing.
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Thirty Matches on One Segment jbarry6899 Family Finder Advanced Topics 12 5th February 2015 07:24 PM
Many Matches on Same Segment on Gedmatch Stezinec DNA and Genealogy for Beginners 5 20th September 2013 05:44 AM
Multiple segment matches on Chr 5 Mendomaid Family Finder Advanced Topics 0 14th September 2013 05:16 PM
Multiple matches on small segment marietta Family Finder Advanced Topics 1 25th June 2013 11:25 AM
64/67 to 67/67 Matches Where do your lines cross? pmed8 DNA and Genealogy for Beginners 6 7th March 2009 02:59 PM


All times are GMT -5. The time now is 12:36 AM.


Family Tree DNA - World Headquarters

1445 North Loop West, Suite 820
Houston, Texas 77008, USA

Phone: (713) 868-1438 | Fax: (832) 201-7147
Copyright 2001-2010 Genealogy by Genetics, Ltd.
Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.