i am not sure, i think a lot is socialisation, my four boys are all very different from each other.
no 1, quiet, a bit 'geeky' likes to read, draw, enjoys science and maths etc has NEVER been a phsysical child ever and hates sport now at 13yrs.
ds2 very active and phsysical, crawled and walked early, loves any sport, but also likes drawing, reading and crafts.
ds3 again early crawler/walker, not into sport really but loves riding bike/scooter. loves crafty stuff and is very inot pink/purple, fairies and princesses.
ds4 very physical, at just 4 and in reception he has great oral skills, knows all his phonics etc but cannot/will not write, his pen control/fine motor skill is crap and he wont sit and draw, doesnt like crafts etc.
then i have dd, 22mths, she is very physical, loves running around and climbing but is a BIG fan of dolls and cuddly toys and the toy kitchen etc.
we have had the same toys for all of them and she has acess to all the 'boys' toys but she does really like dolls, goes straight to them at toddler group and plays with ds3's doll and pushchair at home. will ist with the argos catalogue and flick through all the pages until she gest to the pink/girly/dolls page when she gets all excited and claps and then spends ages saying 'baby dollly, pushchair' etc. she also loves crafty things and at toddler groups is very independent and will sit and do sticking and colouring, woe bedite me if try to help her!
anyway they are all different, but i am finding it interesting to watch how dd develps her own likes and dislikes after the four boys, all of whom love cars, diggers, any vehicles. dd is a fan of buses tho.