My only African Violet at the moment is the "yellow violet" cultivar "Warm Sunshine". I have two unrelaed question

1. I knwo when the "yellows" first came out it was a big thing in the AV world. Was it ever determined if yellow was a new mutation? How is yellow inherited (when breeding AVs by seed).

2. I took a bunch of leaf cuttings. Warm Sunshine has a dark leaf with a reddish back. One of the resultant plantlets has a lighter (by comparison) green leaf (just a couple small area of dard.red). It is as large and as healthy as all the "normal" seedlings. None are blooming size yet. In any case, does this change in leaf color happen often and should I expect the flower color to be normal?