I have read that variegated Adeniums tend to "throw" albino seedlings, though that would likely be a process different from genetic albinism, more related to the process whereby many variegated plants will send out an albino stem or branch.
The situation here looks like a typical genetic recessive. In animals when offspring are produced from non-albino parents that both carry the albino gene, statistically 25% of the offspdring will be albino. Of 16 seedlings, 4 are albino, 25%.
I find the apparent presence of an albino gene in plants quite interesting.
Ron
