Does aging happen by chance? Is aging
breaking down of an organism till
latter eventually stops working?According to Valter Longo’s latest research, which was published in
September 27 edition of
Journal of Cell Biology, aging is a programmed process. For Longo’s part, aging is supposed to ensure
premature death of
majority of a population.
The dead will then consequently provide nutrients for
sake of a few individuals who have acquired genetic mutations. (Think of yeast rather than big complex mammals.) These mutants are more adapted to their environment than
other ‘normal’ organisms. Therefore these ‘sacrificial’ deaths increase
chances of reproduction of
mutants as
latter will have more nutrients to feed on.
Now Charles Darwin may not be very happy with Longo’s theory. Darwin’s natural selection happens at individual level. The better suited to its environment an organism is,
more probable that it will reproduce. This ensures that
species changes or evolves over time as such type of reproduction brings genetic changes to
offsprings. This makes
offsprings more adapted to their ever-changing environment.
Longo’s theory however rests on
group selection theory. Many scientists think that this theory is incorrect. The latter proposes that selection happens not at individual level but at group level instead.