Sebbie Gosling colors? What determines Sex? What determines Colors?

[Golden Valley Farm]

If you have a colored mother say blue and bred back to pure white gander the sons will be blue and the females will be splashed. I was saying the previous post that if the person that had gray and saddleback out of a white female that had white parents and grandparents , was that there must have been mixed in her whites in order to come out with that much color.