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Darwin’s Evolutionary Scheme

Darwin set out his main arguments in Chapters 2 and 3 of The Origin of Species. He stressed a number of key aspects: the struggle for existence, variation, natural selection, extinction and species divergence. These ideas are woven into a very readable and perceptive text that gives an account of his biological knowledge and his experience of the breeding techniques of pigeon fanciers and farmers.

A few short quotations from the Origin are given below which give the core of the theory. They are taken from Darwin’s first edition of 1859.Darwin, C, The Origin of Species.

Owing to the struggle for life, any variation, however slight and from whatever cause preceding, if it be to any degree profitable to an individual of any species, in its infinitely complex relations to other organic beings and to external nature, will tend to the preservation of that individual, and will generally be inherited by its offspring. (p115)

The preservation of favourable variations and the rejection of injurious variations, I call Natural Selection. Variations neither useful nor injurious would not be affected by natural selection, and would be left a fluctuating element... (p131)

It follows that as each selected and favoured form increases in number, so will the less favoured forms decrease and become rare. Rarity, as geology tells us, is the precursor to extinction. (p153)

According to my view, varieties are species in the process of formation, or, as I have called them, incipient species (p155)

This results in a ‘branching-tree’ view of evolution, rather than a step-ladder of progress, or a series of isolated ‘special creations.’ The key ingredients in the scheme, then, are:

  • Variations occurring spontaneously, not themselves directly produced by the environment

  • Competition for resources, so that only the best adapted survive to reproduce

  • Therefore, ‘selection,’ by the environment, of which variants will survive and increase in number.

Email link | Feedback | Contributed by: Dr. Christopher Southgate and Dr. Michael Robert Negus
Source: God, Humanity and the Cosmos  (T&T Clark, 1999)

Evolutionary Biology and Theology

Index - God, Humanity and the Cosmos, 1999 T&T Clark

Darwin’s Evolutionary Scheme

Related Book Topics:

Important Evolutionists Before Darwin
Influences on Darwin
Darwin and the Term ‘Evolution’
Darwin’s Challenge to Theological Positions
Some Recent Debates About Evolution
From Darwinism to Neo-Darwinism
Punctuated Equilibrium and Radical Contingency
Self-Organisation and the Development of Complexity
The Rhetoric of Darwinism
Evolution as a Science of the Unrepeatable Past
The Evolution of Hominids
The Neanderthals
The Paradox of the Development of Modern Humans
Religious Responses to the Science of Human Evolution
Humans as Made in the Image of God
The Doctrine of the Fall
The Science of Sociobiology Critiques the Truth-Claims of Religion
Evolution and Theology

Source:

Dr. Michael Robert Negus and Dr. Christopher Southgate in God, Humanity and the Cosmos. Published by T&T Clark.

See also:

Charles Darwin
Chromosome
DNA Double-Helix
Evolution
Purpose and Design
Does God Act?
Where did we Come From?
Opinions
Books on Biology, Genetics and Theology