It is exactly what I said for I explicitly recognized that a system (or a sequence) unable to perform the function has zero FI.
If most of the sequence required is there, it means that it has almost all the necessary bits of information to implement the function.
I really don’t understand your feud here.
@gpuccio has learned us that « FI is a property of the function, the minimal number of specific bits necessary to implement the function ». A given sequence of aa can or cannot implement the function. If it can, it means that it has all the specific bits necessary to perform the function. If it can’t, it means that one or more bits is missing. In my example of the CFTR mutant, the right aa is missing at position 508, meaning that the mutant CFTR lack 4,3 bits to perform the function.
You’re wrong here. To see this, please consider my example of the mutant CFTR gene. Would you say that by reversing the Pro into a Phe at position 508 the physicians would have generate an amount of information equal to the FI of the functional CFTR?
Function is a possible attribute of a sequence. Indeed and again, a sequence can implement a function or not. If it can, then it has all the FI, ie, all the specific bits necessary to implement the function.