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The gauge-boson, ghost and fermion propagators as well as thegauge-boson--ghost vertex function are studied for SU(N), Sp(2N) and SO(N)gauge groups. We solve a set of coupled Dyson-Schwinger equations in Landaugauge for a variable, fractional number $N_f$ of massless fermions in thefundamental representation. For large $N_f$ we find a phase transition from achirally broken into a chirally symmetric phase that is consistent with thebehavior expected inside the conformal window. Even in the presence of fermionsthe gauge-boson--ghost-vertex dressing remains small. In the conformal windowthis vertex shows the expected power law behavior. It does not assume itstree-level value in the far infrared, but the respective dressing function is aconstant greater than one.

On the dependence of the Landau gauge ghost-gluon-vertex on the number of flavors