Let’s start by considering a very simple feedback loop, namely a system with just two genes A and B which repress each other.
Such a system can be in two possible states (it is bistable):
A is expressed and thus suppresses B, which is not or hardly expressed.
B is expressed and thus suppresses A, which is not or hardly expressed.
We may perfectly ...
Quantitative vs. qualitative
Quantitative description usually implies numbers, rather than just saying which response follows which stimulus. For example, describing a chain of biochemical transformations is qualitative description - we know what processes happen, in which order, etc. Quantifying how many of the molecules would actually undergo this ...