Background on the process of diluted gene fragments passing from generation to generation

Here are some good resources to explain gene fragments passed down from a common ancestor to generation to generation.

http://www.isogg.org/wiki/Identical_By_Descent_segment

http://www.isogg.org/wiki/Wiki_Welcome_Page

http://www.isogg.org/wiki/Relative_Finder#Thresholds_for_relationship_matches

http://www.isogg.org/wiki/Autosomal_DNA_tools

There is an interesting user-controlled animation here:

http://learn.genetics.utah.edu/content/begin/tour/

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