  We study parameters of an extension of the Standard Model. The neutrino
sector is enlarged by one right-handed singlet field, allowing for the seesaw
mechanism type-I, and the Higgs sector contains one additional doublet, which
contributes to light neutrino masses through one-loop radiative corrections.
Employing an approximation for the effective light neutrino mass matrix we
express the masses of the light neutrinos analytically, allowing us to
parametrize the Yukawa couplings to neutrinos by the experimental measurements
on the neutrino sector and only two free parameters. We focus on a
CP-conserving Higgs potential for which we present the allowed ranges of the
input parameters and a statistical overview over the possible values of the
Yukawa couplings.
