  The conditions of the chromosomes inside the nucleus in the Rabl
configuration have been modelled as self-avoiding polymer chains under
restraining conditions. To ensure that the chromosomes remain stretched out and
lined up, we fixed their end points to two opposing walls. The numbers of
segments $N$, the distances $d_1$ and $d_2$ between the fixpoints, and the
wall-to-wall distance $z$ (as measured in segment lengths) determine an
approximate value for the Kuhn segment length $k_l$. We have simulated the
movement of the chromosomes using molecular dynamics to obtain the expected
distance distribution between the genetic loci in the absence of further
attractive or repulsive forces. A comparison to biological experiments on
\textit{Drosophila Melanogaster} yields information on the parameters for our
model. With the correct parameters it is possible to draw conclusions on the
strength and range of the attraction that leads to pairing.
