  Let $M$ be a topological space that admits a free involution $\tau$, and let
$N$ be a topological space. A homotopy class $\beta \in [ M,N ]$ is said to
have {\it the Borsuk-Ulam property with respect to $\tau$} if for every
representative map $f: M \to N$ of $\beta$, there exists a point $x \in M$ such
that $f(\tau(x))= f(x)$. In this paper, we determine the homotopy classes of
maps from the $2$-torus $T^2$ to the Klein bottle $K^2$ that possess the
Borsuk-Ulam property with respect to a free involution $\tau_1$ of $T^2$ for
which the orbit space is $T^2$. Our results are given in terms of a certain
family of homomorphisms involving the fundamental groups of $T^2$ and $K^2$.
