With the news studies in EPIGENETICS, classic breeding beliefs are in for a topsy turvy re-evaluation as even IF a gene is transferred to an offspring (and EVEN IF we knew what specific genes amounted for what in the baby, which we currently do not) we could not know if they were activated or not by the operator genes.
No activation, then NO specific protein is made from what that gene codes for.
http://learn.genetics.utah.edu/content/epigenetics/
The American Racing Manual is littered wiht A+ breedings that sold for big bucks and did nothing and the blue collar ones sneak in all the time. 4 clones of Ribot and the 5 of Northern Dancer prove it is truly a crap shoot.