Nova
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In my opinion, male/female body type is all about the chromosomes.
otto, this is a more complicated issue than you seem to realize and I admit I am not qualified to explain it fully. But secondary sex characteristics depend heavily on hormones, which vary greatly from individual to individual and may also be artificially manipulated at the onset of puberty.
We've had threads where this was discussed at length by parents of children who had such issues. I'm sorry I don't understand the science well enough to explain it better.
Chromosomes have an impact, of course, but they are really only the beginning. (I think geneticists are coming to this conclusion about all genes. They may dictate potential, but various other factors intervene to make the eventual individual.)
(ETA Donjeta said all this better above.)