Backings:
I used small sample populous to make statistics
Blue was most dominant followed by purple/pink, green, and gold.
The male parent has more influence on traits like eye color, Mane color, Coat color, and Hair type.
The female parent has more influence on Sex of the offspring.
Race is determined my family history, influenced more by male parent.
Unicorn and pegasi are equally likely before being influenced by a male parent, while earth pony is usually going to be covered by the unicorn or Pegasus race.