> Somewhat confusingly for geneticists sticking to these terms, the apparent dominance and recessiveness can change according to how much of the chemical the organism is exposed to.  The last bit is just saying that a gene can have multiple effects.  Some effects may appear dominant, others may appear recessive.

> Does that work for you?  I'd just have said that the trait is co-dominant, but that the level of challenge influences the response.

Yes, thanks.  The original sounded like evasive bafflegab to me. 

I like your version better, although I now see you are saying the same thing, only plainly.  Are there subleties that caused the original author to weasel?  (Don't answer that).

Leaving out "apparent" and "effective" sounds more straightforward and honest, since what is "apparent dominance", really?

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