Sorry, you can't.
You get the research option after recruiting Tali.
You must play on hardcore or insane the whole level without changing for it to be there. It is located on Haestrom in the recruit tali mission. it is on the floor in the room that tali is located in.
Because if you make Tali kill herself in mass effect 3 it's funny
You can't. But if you completed her loyalty mission without having her exiled then I believe she would become an Admiral
not sure what you part you need it but if i am guessing when you enter the omega 4 relay, either tali, kasumi or legion, you can pick any of those three so long there loyal to you
It depends on your decisions, for example Mordin, Grunt, Tali or any other replacement characters die if you choose wrong, Legion dies no matter what and Separd can survive if you get readiness to 95% or above.
Tali Lennox's birth name is Tali Fruchtmann.
Giat Tali's birth name is Tali Giat.
tali is
Thane, Garrus, Jacob, Miranda, Tali, Legion, Grunt, Jack, Mordin, Samara/Morinth. Those are the normal ones. If you get the downloadable ones you can also add Zaeed and Kasumi.
You first run into Tali at Freedom's Progress,but at the end of the mission she is not recruitable as she has her own mission to take care of. However, later on you will be able to help her with her mission,which will lead to her becoming recruitable for your suicide squad.