Being an avid student of genetics and experienced in breeding for more than 50 years, I would like to make a disclaimer about the breeding statistics in relation to colors: Kathyinmo posted the supposed true genetic patterns of blue-types, and she was accurate.
BUT some blacks may be masking a silent blue genome that is back in the linage (we would call this a silent recessive) so there may be a few blue or grayer black throw-offs show up in a large hatch with the particular G1's (the #1. cross). A similar occurence may happen with #3. cross (splashes will sometimes show up as throw-offs), and again in #5. cross (blacks will sometimes show up as throw-offs); although, superfically looking at the G1's supposed expression, there should be no odd colors.
1. Black (BB) x Black (BB) = 100% Black
2. Black (BB) x Blue (Bb) = 50% Black, 50% Blue
3. Black (BB) x Splash (bb) = 100% Blue
4. Blue (Bb) x Blue (Bb) = 25% Black, 50% Blue, 25% Splash
5. Blue (Bb) x Splash (bb) = 50% Blue, 50% Splash
To give you an example of what I am speaking of in a different breed, I purchased a standard poodle that came from parents, grandparents and great grandparents of 55 pound sires and 45-50 pound dams, so statistically and genetically my male should have been around 55-58 pounds. By eight months old he was 80 pounds, so I inquired. It was a 8-generation backline that had 80 pound sires and 75 pound dams. His silent recessives from both parents finally lined perfectly up to express themselves, yet all his siblings were 50-55 pounds - just a fluke and one that was to my benefit. He was a gorgeous pony size boy.