Gender differences in professions

Is gender differences caused by a cultural aspect or biological?

In the video, Harold was trying to find out the different reasons to why there is a gender difference in terms of professions.
He looked at the biological aspect as well as the cultural reasonings. Through his findings, he talked with many different researchers who all had a subjective opinion.

One of the main researchers stated that society shapes the gender differences and often leads males and females into different paths, such as introducing barbies to females at early age, whilst the males are left with mechanical toys. This shapes their profession in the future and often leads to women working in hospitals and etc, while males are engineers or mechanics.
However a popular opinion by one of the researchers stated that gender differences is caused from an early age, proving to be biological. The researchers conducted a study which tested the preference of male and female toys to babies. The new born babies clearly showed a preference depending on their gender, as males went for the mechanical toys whilst the females directed themselves towards the "princess" toys.
This theory proves that gender differences is caused by a biological extent however it is also mixed with cultural.
Another theory states that gender differences is caused by a mix of the two, saying that society will push genders towards their respective professions.

Personally, I believe that gender differences originates from a biological perspective. The proof is rather substantial and most of the researchers studying the cultural aspect cannot explain the results found in the experiments.

Further Knowledge questions :

- To what extent might these vary according to age, education or cultural background?

- To what extent might this distinction between private knowledge and public knowledge be

culturally dependent?