A theorem of William Jaco
and Eric Sedgwick states that if M is an irreducible, ∂-irreducible 3-manifold with
boundary a single torus, and if M contains no genus one essential (incompressible
and ∂-incompressible) surfaces, then M cannot contain infinitely many distinct
isotopy classes of essential surfaces of uniformly bounded genus. The main result in
this paper is a generalization: If M is an irreducible ∂-irreducible 3-manifold with
boundary, and M contains no genus one or genus zero essential surfaces, then M
cannot contain infinitely many isotopy classes of essential surfaces of uniformly
bounded genus.