Arm folding

Arms crossed left over right (phenotype L)
Arms crossed right over left (phenotype R)

The manner in which a person folds their arms is a dynamic morphological demonstration of two alternative phenotypes. Once adopted, manner of arms folding across the chest does not change throughout the lifetime and persons easily give up the unusual folding position, most commonly at the first attempt.

If the right arm is folded above the left forearm, the phenotype is characterised as R (right; the right type), and in the opposite case, i.e. if the left arm is positioned above the right, it is the phenotype L (left; left-type).

It has been shown that the phenotypes of these properties are distributed independently with left-handed and right-handed people.

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