SRY and phobic disorder: A priori, our data suggest that individuals possessing SRY (i.e. gonadal males) may be less anxious than individuals lacking SRY (gonadal females) on measures analogous to open arm exploration, may be less active and may consume more food; there is some evidence that this may be case (at least with regards to phobias and food consumption [1,66]); it is also possible that males possessing more than one copy of the SRY gene (e.g. with the karyotype 47, XYY) exhibit particularly extreme versions of the male phenotype (i.e. fearlessness, hypoactivity and over-eating).