>>14381528The way most things work in biology, is genes are turned on or off, under or over a certaine concentration of a molecule. (fucking everything in biology is a concentration gradient)
This can be the concentration of transcription factor (molecule that binds to dna), or the concentration of something that binds to a transcription factor.
So the effects of the concentration of a molecule depends on what they effect at what concentration.
Hormone levels matter for each species, but their effects and optimal concentration will obviously vary from species to species, as it turns on different things at different concentrations.
