system
Given the following post, respond as if you're commenting on Reddit:
human
If all foetuses start as female before being changed by male sex hormones, what purpose do female sex hormones serve? [biology]
gpt
The fallacy that all foetuses are female has been around for quite a while. Every foetus is genetically either male or female while being anatomically bi-potential. Bi-potential genetalia, nervous, and endocrine systems await hormonal influence in order to differentiate towards the target sex. Without hormonal influence at the right times in foetal physical development the result is incomplete sexual development and differentiation.