What you say is true...except you don't know the lineages...there is also homozygous dominance, heterozygous recessive, codominace, polygenic traits and epistasis involved as well as dihybrid and trihybrid influences to consider....can get very complicated real fast.
If peach is truly a...
Peach, Peach Splash and Yellow all look similar in feather color and pattern when hatched....Peach and Peach Splashes will have a light gray color with diffused stripes, where as the Yellow's will have very distinct stripes and more white/yellow down.
Within a month, the Peach and Peach Splash...