  We study the expected number of zeros of $$P_n(z)=\sum_{k=0}^n\eta_kp_k(z),$$
where $\{\eta_k\}$ are complex-valued i.i.d standard Gaussian random variables,
and $\{p_k(z)\}$ are polynomials orthogonal on the unit disk. When
$p_k(z)=\sqrt{(k+1)/\pi} z^k$, $k\in \{0,1,\dots, n\}$, we give an explicit
formula for the expected number of zeros of $P_n(z)$ in a disk of radius $r\in
(0,1)$ centered at the origin. From our formula we establish the limiting value
of the expected number of zeros, the expected number of zeros in a radially
expanding disk, and show that the expected number of zeros in the unit disk is
$2n/3$. Generalizing our basis functions $\{p_k(z)\}$ to be regular in the
sense of Ullman--Stahl--Totik, and that the measure of orthogonality associated
to polynomials is absolutely continuous with respect to planar Lebesgue
measure, we give the limiting value of the expected number of zeros of $P_n(z)$
in a disk of radius $r\in (0,1)$ centered at the origin, and show that
asymptotically the expected number of zeros in the unit disk is $2n/3$.
