  An acyclic digraph in which every vertex has indegree at most $i$ and
outdegree at most $j$ is called an $(i,j)$ digraph for some positive integers
$i$ and $j$. The phylogeny graph of a digraph $D$ has $V(D)$ as the vertex set
and an edge $uv$ if and only if one of the following is true: $(u,v) \in A(D)$;
$(v,u) \in A(D)$; $(u,w) \in A(D)$ and $(v,w) \in A(D)$ for some $w \in V(D)$.
A graph $G$ is a phylogeny graph (resp. an $(i,j)$ phylogeny graph) if there is
an acyclic digraph $D$ (resp. an $(i,j)$ digraph $D$) such that the phylogeny
graph of $D$ is isomorphic to $G$. Lee~{\em et al.} (2017) and Eoh and Kim
(2021) studied the $(2,2)$ phylogeny graphs, $(1,j)$ phylogeny graphs, $(i,1)$
phylogeny graphs, and $(2,j)$ phylogeny graphs. Their work was motivated by
problems related to evidence propagation in a Bayesian network for which it is
useful to know which acyclic digraphs have chordal moral graphs (phylogeny
graphs are called moral graphs in Bayesian network theory). In this paper, we
extend their work by characterizing chordal $(i,2)$ phylogeny graphs. We go
further to completely characterize $(i,j)$ phylogeny graphs by listing the
forbidden induced subgraphs.
