ADSA Joint meeting 2007 (
9
)
VanRaden & Tooker
2007
Unrelated Individuals?
Ø
No known common ancestors
Ø
Many unknown common ancestors
born before the known pedigree
Ø
Relationships in base
•
0
± x.x%
due to earlier ancestors
•
Called linkage disequilibrium (
LD
)
•
Poor terminology, genes may not be
physically linked
IF pedigrees, stop at 1960,
ancestors are assumed to be unrelated.
But, actually, before the known pedigree,
somewhere they are related……
A better term may be gametic disequilibrium.
Look at these relationships…….
Hopefully, the previous slides will become clear.