[betty boop]

What appears as phenotype in any progeny will be elements of the set of what's possible, nothing else.

What or who defines "what is possible?"

[spunkets]

Re: What appears as phenotype in any progeny will be elements of the set of what's possible, nothing else.

"What or who defines "what is possible?"

The possibilities are not defined. They're the possible phenotypes that can arise from the dynamics and reactions that can occur in the given physical system.