  Gauge and Yukawa (for the third family) coupling unification seem to be the
best predictions of the grand-unified theories (GUTs). In supersymmetric GUTs,
one also expects that the sparticle masses unify at the GUT scale (for
sparticles embedded in the same GUT multiplet). I show under what circumstances
GUTs do not lead to sparticle mass unification. In particular, I give examples
of SU(5) and SO(10) SUSY GUTs in which squarks and sleptons of a family have
different tree-level masses at the unification scale. The models have
interesting relations between Yukawa couplings.
  For example, I present an SO(10) GUT that allows for a large ratio of the top
to bottom Yukawas, accounting for the large $m_t /m_b$. The splittings can also
be induced in the Higgs soft masses and accommodate the electroweak breaking.
