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We investigate the possibility of adding a fourth generation of quarks. Wealso extend the Standard Model gauge group by adding another SU(N) component.In order to cancel the contributions of the fourth generation of quarks to thegauge anomalies we must add a generation of fermions coupling to the SU(N)group. This model has many features similar to the Standard Model and, forexample, includes a natural generalisation of the Standard Model chargequantisation rule. We discuss the phenomenology of this model and, inparticular, show that the infrared quasi-fixed point values of the Yukawacoupling constants put upper limits on the new quark masses close to thepresent experimental lower bounds.Comment: uuencoded 17 page LaTeX file plus 2 postscript figures, uses epsf.st

Could there be a fourth generation of quarks without more leptons?