The manner in which a person folds their arms is a dynamic morphological demonstration of two alternative phenotypes.
The main conclusion is that the manifestation of alternative phenotypes with these characteristics is irrespective of sex and age, and that it is not related to handedness.
Supporters of the assumptions that genetic factors play an important role in forming these properties are reinforced by the data of very heterogeneous frequencies of alternative phenotypes (R and L) in the explored portion of the world's population.
But the point of view that basic genetics could explain the phenomena has also been put in discussion; it is not accepted by all researchers.
[12] Luria (1947/1970) proposed left-top positions in arm folding (AF) and hand clasping (HC) to be signs of "latent left-handedness".