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

Thread Tools Display Modes
Old 6th August 2017, 08:09 PM
Slithy Tove Slithy Tove is offline
FTDNA Customer
Join Date: Dec 2016
Posts: 25
Originally Posted by Randy583 View Post
To: whoiis,

A simple analogy to a person's DNA, or genes, can be represented by a deck of 52 playing cards.
Suppose mom represents a deck of 52 red cards, dad1 represents a deck of 52 blue cards and dad2 represents a deck of 52 green cards.
Child1 of mom and dad1 is created by shuffling mom's deck, shuffling dad1's deck and dealing out 26 cards from each, then combining the delt cards into a deck of 52 cards containing 26 of mom's red cards and 26 of dad1's blue cards.
Child2 of mom and dad2 is created by shuffling mom's deck of 52 cards again, shuffling dad2's deck of 52 cards and dealing out 26 cards from each, then combining the delt cards into a deck of 52 cards containing 26 of mom's red cards and 26 of dad2's green cards.
Child1 and child2 will each have 26 of their mom's red cards, but they will not be the SAME 26 red cards! On average only about half of each child's red cards, that came from their common mom, will match between the siblings. So these two siblings will only share about 25% of their mom's genes and none of their different father's genes (they are half-blood siblings).

Except that there's too many cards in those decks. So throw away 6 cards from each deck.

And then take recombination into account. So take a red card and a blue card and tear them in two into varying but inversely complementary sizes. Tape the complementary pieces together and do the same for every pair of red/blue cards in the deck so you have a deck of cards that are part red and part blue.

Now redistribute as above...
Reply With Quote


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
Can a female who has taken the FF test match a Male who has only taken the Ydna test DMK Family Finder Basics 4 24th September 2016 01:33 PM
How to enter a FF test result into a Surname Project but w/o also entering Y-DNA test Bill Harvey Group Administrators - Advanced Chat 2 13th June 2014 12:09 AM
Will a YDNA test brake down a FFDNA test Lorraine Family Finder Advanced Topics 11 2nd May 2012 06:43 AM
What does the FF test offer to the Y line that a normal YDNA test cannot? Zaru Paternal Lineage (Y-DNA STR) Advanced 3 18th February 2011 08:31 AM
Upgrading Oxford Matrilne test to FT Full MtDNA Test Hando mtDNA - Advanced Topics 15 17th January 2008 12:40 PM

All times are GMT -5. The time now is 03:17 PM.

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.