Originally posted by: ZakuHan
Actually both Chuunins and Jounins are in charge of teaching genins. Iruka and Mizuki were teaching Naruto's class, but we know some of the Jounins teach as well. I think it's just that Jounins are in charge of the in-field training, and are more of a babysitter on missions than anything.
chuunins are only incharge of cadets. and in the ep we see that idate was recomended for the chuunin exam, and only a jounin sensie can do that.