The Chicken or The Egg?

On page 124, Trenholmse tells us that "people have strong reaction to body shape and appearance." She suggests that there are three main body types:

1.       Endomorph body shape – short, round and fat.
Endomorph characteristics – placid, contented, affable, generous, and affectionate.

2.       Mesomorph body shape – average height, muscular and athletic.
Mesomorph characteristics – energetic, enthusiastic, competitive, reckless, and optimistic.

3.       Ectomorph body shape – tall, thin, and frail.
Ectomorph characteristic – self-conscious, precise, shy, awkward, serious, and sensitive.

It is again very interesting to realize that, to a certain degree, we have no control over some of the nonverbal messages that we sencommuincate to others. This topic also remind me of a previous realization, that it is impossible to not judge other people. As it suggested, we unconsciously make judgment about people based on their body shape.
I can't help but to wonder, which came first, the chicken or the egg? ; is body shape and characteristics are genetically tie together? Or is it society and cultures that condition individuals, with a specific body shape, to adopt specific characteristics?