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I don’t like white leg markings on my solid horses. From my experience, SandycreekFarm’s advice has helped me keep my solid horses looking more solid, but it is NOT an exact linear science. In my example below, you can see two different gens of lesser white factor (WF) yielding greater WF than either parent showed.

My fourth generation mare whose pedigree demonstrates the wibby-wobbly inheritance of white factor:
4G RR Emphasis on Improve

If you don’t feel like opening 15 pages of horses, here are the WF:

Gen 4: Medium
Gen 3: None x Large
Gen 2: Min x Min, Light x Medium
Foundation: Min x Min, Min x Light, None x None, None x Large

My goal for this line: black draft, WF none, no w20, without GMTing every undesired gene off each horse. As you can see, this is easier said than done. None x None produced Light, bred with Medium produced Large. Why does this happen? I’m not sure. At that point, I begged the horses: “PLEASE quit INCREASING! I want less, not more!” Apparently, it worked, because the 4th gen was a medium.

Don’t forget to remove w20, too, if you really don’t want high leg markings. Even with a white factor of none, your horse can still have lots of leg chrome if w20 exists.

All of the white spotting kit genes, both types of sabino, and Tobiano, splash, and frame contribute to an increase in WF, yes. Appaloosa does not contribute to the WF increase and is not factored in when looking at possible lethal foals either.