
Stanton D. answered 11/26/20
Tutor to Pique Your Sciences Interest
Hi Monica A.,
So what would be wrong with assuming that the mutation(s) inheritable retinoblastoma is(are) present ab initio in the embryo, hence in every cell of the baby (and perhaps associated with a predisposition to other forms of cancer as well?), whereas the non-inheritable one is a mutation at a later stage of development, such that only tissue of one eye is affected? (all you need for the latter is just one sufficiently mutated cell, after all, and possibly immune system disfunction to a degree). I leave it for you to work out the details.
-- Cheers, -- Mr. d.