Crappymummy
Very happy to clarify and do let me know if this is not clear.
Toy preferences are undoubtedly influenced by a huge number of social and cultural factors (including parental biases and influences, societal pressures, peer group chastisement, marketing, TV and a whole lot of other things).
In addition to the above, we cannot ignore those aspects of who we are and what has made us who we are - over which we may have less conscious control.
Here are just a few factors that I believe could also be playing a role in toy preferences
CORRELATION DOES NOT MEAN CAUSATION. THIS NOT AN EXHAUSTIVE LIST
Hormones
On average boys and men have between 5-10 times as much testosterone in their bloodstream than girls and women. During periods of early development, gonadal hormones - particularly androgens influence sex differences in rough physical play in both human and non human primates.
Brain Differences
There are reliable sex differences in the general population in terms of Empathising and Sytemising. The nucleus in the anterior preoptic portion of the hypothalamus is twice as large in men as it is in women (See Blum 1997, Geary 2010, Panksepp 1998). This region is covered with testosterone receptors. The hypothalamus controls the pituitary gland which in turn instructs the testes and adrenal gland to make yet more testosterone.
Evolutionary Psychology
Male infants show a greater attraction (on average) to toys involving movement. Female infants show a greater interest (on average) in toys representing animals.
Testosterone is linked to the drive for competing, status and social dominance. The most visible clue to physical dominance - height is, to this day, still correllated with sexual attractiveness as well as success in professional and political realms. There is a correlation between squareness of jaw line and the eventual military rank attained by male graduates of West Point.Teenage boys take more physical risks when there are girls present. There is clear gender gap in areas such as over-confidence, violence, risk-taking and group vs group hostility. I do not believe tools were only made by men. I do believe something dramatic happened in the evolution of hominid and human brains to set us apart in areas such as collaboration, language and technology (and that this started with the control of fire). I do not believe evolution is a linear progression. I do believe we have lots to learn in this field even though we don't have a time machine to provide definitive evidence.
Heredity
The IQs and likelihood to commit violent crime in adopted children correlates more with their biological siblings than their adoptive ones. Studies of identical twins separated at birth show that the "blank slate" theory (nurture trumps all) does not hold true.
Brain Physiology
Recent research suggests that the dramatic changes in the personality of Henry VIII may have been caused by specific jousting injuries. A bump on the head may have changed the course of world history. The story of Phineas Gage contributed to the identification of specific regions of the brain that influence Rage and Fear (both of which in turn influence the taking).
A nuanced and complex mix
So hormones, brain structure, DNA, physiology, anthropology, psychology and yes our evolutionary history mean it's complicated.
I believe it is unscientific to say "Oh of course, my own psychological processes have evolved but evolutionary psychology is bollocks". How can you have one without the other?
I have not said "Wheels cos testosterone alone" or "Pink cos pickin berries". In fact I have called out such misrepresentations. I think they are ideologically motivated by people when it dares to question "Cos Patriarchy".
I don't believe in "banning" children from playing with the toys they are attracted to (as long as they are safe). I do believe in allowing children to have access to toys which are non-stereotypical for their sex.
I personally would not "cordon off" any section of the toy shop (e.g. guns and swords) to my sons or daughter.
Let me know if any of the above is not clear.