21 of the 29 meiotic genes were also present in G. lamblia .
It appears that most of these meiotic genes were likely present in a common ancestor of T. vaginalis and G. lamblia .
Since 21 of the 29 meiotic genes were also present in G. lamblia , it appears that most of these meiotic genes were likely present in a common ancestor of T. vaginalis and G. lamblia .