The last stage of embryonic development where the embryonic stem cells are found is the blastocycst. In this stage the cell differentiates and group themselves into different body parts and specialized cells. This stage is reached with in the period of 3 to 5 days of the embryo development.
Please be a little more specific on what you want to ask. I can be of some help.
The answer you are looking for is right here, Gogli Apparatus is the answer
Answer is females.
Hope this helps
