The slope of the reaction norm defines the degree of tolerance.
2.
Schematic of the reaction norm of tolerance ( after ).
3.
This is a reaction norm in which host performance ( on y-axis ) is regressed against an increasing pathogen, parasite or herbivore burden ( on x-axis ).
4.
In plants, where the concept was originally used, tolerance is defined as a reaction norm of host fitness over a range of parasite burdens, and can be measured from the slope of the line fitting these data.
5.
Geodakyan suggested that males differ from females by having a wider genetic deviations ( i . e . ( 2 ) component ) whereas females have a wider ( 1 ) component reaction norm and are more sensitive to environmental adjustment ( component ( 3 ) ):
6.
What you would want to evolve optimally is a reaction norm-a set of responses to different environments, anywhere a New Yorker might want to travel ( but where might that be, and where would he evolve to " want " to ? ).
7.
This can be explained as following : diversity of phenotypes is composed from a genotype-related variance ( that in turn, includes ( 1 ) reaction norm ( i . e . typical features of species, such as humans having two legs and two arms ) plus ( 2 ) genetic deviations from this norm ) and ( 3 ) environment-related variance.
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