\item
P.M.B. Vit\'anyi, Sexually reproducing cellular automata,
\it
Mathematical Biosciences
{\bf 18}
\rm
(1973) 23-54.
 
Abstract:
Sexual reproduction is modeled an investigated in the
formal framework of John von Neumann's theory
of self-reproducing cellular automata.
It is argued that the transition from asexual to
sexual reproduction necessitates a change in number and
structure of the genetic tapes involved.
 To an asexually reproducing
automaton only one genetic tape is attached, viz. the description which
enables the automaton to construct cell for cell a replica of 
itself. The sexually reproducing automaton, however, must possess
two, nearly identical, geneteic tapes of a deviating structure,
i.e., programs partitioned into sections embodying the various
construction
and behavioral algorithms to be executed. It is shown that
the recombination of the parents' characteristics in the offspring
closely conforms to recombination in nature. Similarities and
differences with biological systems are discussed.
 
Comments: The model accounts for many biological phenomena
that are known and predicts phenomena that are not yet known:
e.g. genetics-linked sterility or transsexuality. This may
be of interest to biologists.