The purpose of this project is to learn more about how Tullises worldwide are related by studying genetics. Specifically, the project is studying the Y-chromosome of Tullis males to determine if they have a common male ancestor. Since the Y-chromosome is only inherited by males, it allows us to study the paternal lineage, but it also means that study participation is limited to males.

But that does not stop a female joining us - provided she has this surname in her tree.

Some of you may not be aware of this site - there are some excellent items in here  
 http://freepages.genealogy.rootsweb.ancestry.com/~tullis/genealogy/
I understand the author of the above and this one below, was the originator of this FTDNA project.
It will be good to have him return when he is able.
http://www.tullistrees.org/