  Let G_1 and G_2 be two groups. If a group homomorphism \varphi : G_1
\longrightarrow G_2 maps a \in G_1 into b \in G_2 such that \varphi(a) = b,
then we say a degenerates to b and if every element of G_1 degenerates to
elements in G_2, then we say G_1 degenerates to G_2. In this paper, we study
degeneration in graphs and show that degeneration in groups is a particular
case of degeneration in graphs. We exhibit some interesting properties of
degeneration in graphs. We use this concept to present a pictorial
representation of graphs realized by finite abelian groups. We discus some
partial orders on the set T_p_1 \dots T_p_n of all graphs realized by finite
abelian p_r-groups, where each p_r, 1 \leq r \leq n, is a prime number. We show
that each finite abelian p_r-group of rank n can be identified with saturated
chains of Young diagrams in the poset T_p_1 \dots T_p_n. We present a
combinatorial formula which represents the degree of a projective
representation of a symmetric group. This formula determines the number of
different saturated chains in T_p_1 \cdots T_p_n and the number of finite
abelian groups of different orders.
