1. Life
is often thought of and analysed from the viewpoint of the individual organism.
In a previous post (The Apparent Complexity in Life’s Evolution and Its
Explanation ), I suggested defining life as a process rather than an organism,
therefore clarifying tricky areas such as viruses and their status of being
alive or not, and other life products that may be alive in some situations that
are very conditional e.g. seeds.
In
attempting to explain life from the viewpoint of the individual organism, the
basic function of life appears to be survival of the organism. There have been
plenty of discussions over the fundamental unit of life in the context of
evolution, that have suggested various “vehicles” of life information including
genes themselves, species, populations (Jablonka and Lamb, 2006), etc.
The
issue of course with this viewpoint is that organisms always die. Life clearly
has no interest whatsoever in the actual survival of any given organism into
infinity by itself. Indeed, the same can easily be extended to species. Life
has thrived not through survival of any given individual organism or species at
all, and instead, through survival of life processes spanning countless
individual organisms and species. This entire show has been sponsored by
reproduction.
2.
Reproduction in the
context of life is better or easier than plain survival – but what is it better
at?
It
is better at providing the opportunity for adaptation. Life cannot exist in a
vacuum, and if life is to be a complement of non-life, of the environment, it
must be able to change, to update, through time and space as the universe is
doing.
The
directionality of time explains why reproduction makes more sense than mere
survival ad infinitum. Each cycle, each generation, is a change. And starting
to change from square one, developmentally speaking, is far more
straightforward than starting to change from square 47. Getting babies and
children to learn slightly differently, or gain some new abilities that are
new, is easier than getting a mature, further down the line organism to do the
same.
After
all, adults will have always been selected for as babies for their ability to
be adapted to their present, but not the unknown future. The only way,
apparently, to greet the future, the unknown pressures, is to renew the
organism, or indeed the genome, via reproduction.
3.
Sexual reproduction
has often been discussed as the great enabler of diversification, mutation,
evolution. What about asexual reproduction? What is the point in reproducing
oneself if the result is merely clones all over again? Why make them rather than
simply maintain the already existing organisms?
It isn't just the diversification offered by sexual reproduction that enables life
through reproduction; it is also merely the process of repeating a
developmental pathway, be it a different one or the exact same one all over
again, as it is in asexual reproduction.
Cycling
life, which is defined as certain processes distinct from non-life, has been
much easier, more environmentally or energetically amenable than producing and
maintaining individual organisms themselves ad infinitum. This matter comes
into sharp focus when discussing ageing, death and the role of life’s evolution
in shaping organisms, reproduction, as well as potential directions to be taken
by civilizations to offset these evolved truths in an attempt to break them and
move forward into something else, away from past directions.
4. The
point at which we will be able to offset the reliance of life on reproduction
in its original, or current, sense, is the point at which we are able to enact
changes, adaptations, of mature organisms, that are at least as efficient as
"natural" changes that occur in reproduction.
This
could be things like manipulating the genome, developmental paths, tissues and
functions, etc.
This
obviously is a grand challenge.
After
all... Life hasn't been doing nothing all this time. Or indeed, time hasn't
been doing nothing all this life.
Reference
E.
Jablonka and M. Lamb (2006), Evolution in Four Dimensions: Genetic, Epigenetic,
Behavioral, and Symbolic Variation in the History of Life, MIT Press, ISBN 978-0262600699
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