Question

Darwins theory of evolution its principle and explanation

Answer 1

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).

Answer 2

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.