  We consider the flavour problem in a supersymmetric Grand Unified theory with
gauged SU(6) group, where the Higgs doublets are understood as pseudo-Goldstone
bosons of a larger $\SU(6)\otimes\SU(6)$ global symmetry of the Higgs
superpotential. A key element of this work is that we never appeal to any
flavour symmetry. One main interesting feature emerges: only one of the light
fermions, an up-type quark, to be identified with the top, can get a Yukawa
coupling at renormalizable level. This fact, together with bottom-tau Yukawa
unification, also implied in our scheme, gives rise to a characteristic
correlation between the top and the Higgs mass. By including a flavour-blind
discrete symmetry and requiring that all higher dimensional operators be
mediated by the exchange of appropriate heavy multiplets, it is possible to
give an approximate description of all masses and mixing angles in term of a
hierarchy of grand unified scales. A special ``texture'' arises, implying a
relation between the top mass and the third generation mixing angles. Several
other possible consequences of this approach are pointed out, concerning the
$\mu/s$ mass ratio, the Cabibbo angle and the proton decay.
