  We present measurements of the redshift--space three-point correlation
function of galaxies in the Sloan Digital Sky Survey (SDSS). For the first
time, we analyze the dependence of this statistic on galaxy morphology, color
and luminosity. In order to control systematics due to selection effects, we
used $r$--band, volume-limited samples of galaxies, constructed from the
magnitude-limited SDSS data ($14.5<r<17.5$), and further divided the samples
into two morphological types (early and late) or two color populations (red and
blue). The three-point correlation function of SDSS galaxies follow the
hierarchical relation well and the reduced three-point amplitudes in
redshift--space are almost scale-independent ($Q_z=0.5\sim1.0$). In addition,
their dependence on the morphology, color and luminosity is not statistically
significant. Given the robust morphological, color and luminosity dependences
of the two-point correlation function, this implies that galaxy biasing is
complex on weakly non-linear to non-linear scales. We show that simple
deterministic linear relation with the underlying mass could not explain our
measurements on these scales.
