A model organism is a species that is studied in great detail. The physiology of a model organism is similar to that of another species such as human beings.
Specific biological findings from studies on this species may at least be partially valid for the other species.
Model organisms can therefore be studied more easily than humans who may be difficult or impossible to study for technical or ethical reasons.
Thale cress (Arabidopsis thaliana) is a small plant belonging to the mustard family (brassicas). It is a model organism used in botanical genetic research. © Biopix via eol.org, CC by-nc