Board Thread:Movie discussion/@comment-27198647-20151129152941/@comment-1259419-20170206213200

Mattwo wrote: I thought humans started out as asexual? You are right. The idea goes like this. To make the embryo male, the SRY gene has to become active in the embryo. If that does not happen, or if the gene is repressed, the embryo becomes female. So, the argument can be made that the default setting for an embryo is female.