Darwins theory of evolution its principle and explanation
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Darwin's Theory Of
Evolution
Darwin's Theory Of Evolution - The
Premise
Darwin's Theory of Evolution is the
widely held notion that all life is
related and has descended from a
common ancestor: the birds and the
bananas, the fishes and the flowers
-- all related. Darwin's general
theory presumes the development
of life from non-life and stresses a
purely naturalistic (undirected)
"descent with modification". That is,
complex creatures evolve from
more simplistic ancestors naturally
over time. In a nutshell, as random
genetic mutations occur within an
organism's genetic code, the
beneficial mutations are preserved
because they aid survival -- a
process known as "natural
selection." These beneficial
mutations are passed on to the
next generation. Over time,
beneficial mutations accumulate
and the result is an entirely
different organism (not just a
variation of the original, but an
entirely different creature).
Evolution
Darwin's Theory Of Evolution - The
Premise
Darwin's Theory of Evolution is the
widely held notion that all life is
related and has descended from a
common ancestor: the birds and the
bananas, the fishes and the flowers
-- all related. Darwin's general
theory presumes the development
of life from non-life and stresses a
purely naturalistic (undirected)
"descent with modification". That is,
complex creatures evolve from
more simplistic ancestors naturally
over time. In a nutshell, as random
genetic mutations occur within an
organism's genetic code, the
beneficial mutations are preserved
because they aid survival -- a
process known as "natural
selection." These beneficial
mutations are passed on to the
next generation. Over time,
beneficial mutations accumulate
and the result is an entirely
different organism (not just a
variation of the original, but an
entirely different creature).
Answered by
1
Summary of Darwin's Theory of Evolution
•
A species is a population of organisms that interbreeds and has fertile offspring.
•
Living organisms have descended with modifications from species that lived before them.
•
Natural selection explains how this evolution has happened:
—
More organisms are produced than can survive because of limited resources.
—
Organisms struggle for the necessities of life; there is competition for resources.
—
Individuals within a population vary in their traits; some of these traits are heritable -- passed on to offspring.
—
Some variants are better adapted to survive and reproduce under local conditions than others.
—
Better-adapted individuals (the "fit enough") are more likely to survive and reproduce, thereby passing on copies of their genes to the next generation.
—
Species whose individuals are best adapted survive; others become extinct.
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