The transformations for example if a parent is werewolf the children may be half beast, and if is a trasformation caused by corruption the parent hereditable gene will be altered, if os not working I will check it.
To be perfectly honest I haven’t managed to get a corrupted character pregnant in hundreds and hundreds of turns. It might be that I was trying slimes, because they were near town. I guess I need to try a hornier enemy.
Potion transformations don’t seem to affect birth as far as I can tell.