The eyes of vertebrates (left) and invertebrates such as the octopus (right) developed independently: vertebrates evolved an inverted retina with a blind spot over their optic disc, whereas octopuses avoided this with a non-inverted retina.

Irreducible Complexity

Irreducible Complexity Irreducible complexity (IC) involves the idea that certain biological systems cannot evolve by successive small modifications to pre-existing functional systems through natural selection. Irreducible complexity has become central to the creationist concept of intelligent design, but the scientific community, which regards intelligent design as pseudoscience, rejects the concept of irreducible complexity. Irreducible complexity is one of two...

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Specified Complexity

Specified Complexity Specified complexity is a concept proposed by William Dembski and used by him and others to promote intelligent design. According to Dembski, the concept can formalize a property that singles out patterns that are both specified and complex, where in Dembski’s terminology, a specified pattern is one that admits short descriptions, whereas a complex pattern is one...

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Intelligent Design Movement

Intelligent Design Movement The intelligent design movement is a neo-creationist religious campaign for broad social, academic and political change to promote and support the pseudoscientific idea of intelligent design (ID), which asserts that “certain features of the universe and of living things are best explained by an intelligent cause, not an undirected process such as...

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Fine-tuned Universe

Fine-tuned Universe This article covers the meaning of Fine-tuned Universe. The characterization of the universe as finely tuned suggests that the occurrence of life in the Universe is very sensitive to the values of certain fundamental physical constants and that the observed values are, for some reason, improbable. If the values of any of certain free parameters in contemporary physical...

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Watchmaker Analogy

Watchmaker Analogy The watchmaker analogy or watchmaker argument is a teleological argument which states, by way of an analogy, that a design implies a designer. The analogy has played a prominent role in natural theology and the “argument from design,” where it was used to support arguments for the existence of God and for the intelligent design of the universe, in both Christianity and Deism. Sir...

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Teleological Argument

Teleological Argument The teleological argument or physico-theological argument, also known as the argument from design, or intelligent design argument is an argument for the existence of God or, more generally, for an intelligent creator based on perceived evidence of “intelligent design” in the natural world. The earliest recorded versions of this argument are associated with Socrates in ancient...

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Intelligent Design And Science

Intelligent Design And Science The relationship between intelligent design and science has been a contentious one. Intelligent design (ID) is presented by its proponents as science and claims to offer an alternative to evolution. The Discovery Institute, a politically conservative think tank and the leading proponent of intelligent design, launched a campaign entitled...

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Timeline Of Intelligent Design

Timeline Of Intelligent Design This timeline of intelligent design outlines the major events in the development of intelligent design as presented and promoted by the intelligent design movement. See also: Darwinism and Evolution Creationism Main article: Creationism 1920s: Fundamentalist–Modernist Controversy – in an upsurge of fundamentalist religious fervor, anti-evolutionary sentiment stopped U.S. public schools from teaching evolution, through state laws such as...

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Acceptance of Evolution by Religious Groups

Acceptance of Evolution by Religious Groups This article covers the acceptance of evolution by religious groups. Although biological evolution has been vocally opposed by some religious groups, many other groups accept the scientific position, sometimes with additions to allow for theological considerations. The positions of such groups are described by terms including...

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Microevolution

Microevolution Microevolution is the change in allele frequencies that occurs over time within a population. This change is due to four different processes: mutation, selection (natural and artificial), gene flow and genetic drift. This change happens over a relatively short (in evolutionary terms) amount of time compared to the changes termed macroevolution which is where greater differences in the population occur....

Early cetaceans like Ambulocetus natans possessed hindlimbs, derived from their walking ancestors, but no longer useful in their marine environment.

Macroevolution

Macroevolution Macroevolution is evolution on a scale at or above the level of species, in contrast with microevolution, which refers to smaller evolutionary changes of allele frequencies within a species or population. Macroevolution and microevolution describe fundamentally identical processes on different scales. The process of speciation may fall within the purview of either, depending on the forces thought...

A tulip flower exhibiting a partially yellow petal due to a mutation in its genes

Mutation

Mutation In biology, a mutation is an alteration in the nucleotide sequence of the genome of an organism, virus, or extra chromosomal DNA. Mutations result from errors during DNA replication, mitosis, and meiosis or other types of damage to DNA (such as pyrimidine dimers that may be caused by exposure to radiation or...

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Alternatives To Evolution By Natural Selection

Alternatives To Evolution By Natural Selection Alternatives to evolution by natural selection, also described as non-Darwinian mechanisms of evolution, have been proposed by scholars investigating biology since classical times to explain signs of evolution and the relatedness of different groups of living things. The alternatives in question do not encompass religious...

Darwin researched how the skulls of different pigeon breeds varied, as shown in his Variation of Plants and Animals Under Domestication of 1868.

Reaction To Darwin’s Theory

Reaction To Darwin’s Theory This article covers the reaction to Darwin’s Theory. The immediate reactions to On the Origin of Species, the book in which Charles Darwin described evolution by natural selection, included international debate, though the heat of controversy was less than that over earlier works such as Vestiges of Creation. Darwin monitored...

Charles Darwin

Charles Darwin

Who Is Charles Darwin? Charles Robert Darwin, (12 February 1809 – 19 April 1882) was an English naturalist, geologist and biologist, best known for his contributions to the science of evolution. His proposition that all species of life have descended over time from common ancestors is now widely accepted, and considered...

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Social Effects Of Evolutionary Theory

Social Effects Of Evolutionary Theory The social effects of evolutionary theory have been considerable. As the scientific explanation of life’s diversity has developed, it has often displaced alternative, sometimes very widely held, explanations. Because the theory of evolution includes an explanation of humanity’s origins, it has had a profound impact on...

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The Order In The Universe And Creation According To The Torah

The Order In The Universe And Creation According To The Torah This article covers the relationship between the order in the universe and creation according to the Torah. The Creation of the Heavens and the Earth In the beginning, God created the heavens and the earth. Now the earth was...

Several major ideas about evolution came together in the population genetics of the early 20th century to form the so-called modern synthesis, including genetic variation, natural selection, and particulate (Mendelian) inheritance. This was at the time called neo-Darwinism.

Neo-Darwinism

Neo-Darwinism Neo-Darwinism is generally used to describe any integration of Darwin’s theory of evolution by natural selection with Gregor Mendel’s theory of genetics. It mostly refers to evolutionary theory from either 1895 (for the combinations of Darwin’s and Weismann’s theories of evolution) or 1942 (the “modern synthesis“), though it can mean any new Darwinian- and Mendelian-based theory...

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Evolutionary Argument Against Naturalism

Evolutionary Argument Against Naturalism The evolutionary argument against naturalism (EAAN) is a philosophical argument asserting a problem with believing both evolution and philosophical naturalism simultaneously. The argument was first proposed by Alvin Plantinga in 1993 and “raises issues of interest to epistemologists, philosophers of mind, evolutionary biologists, and philosophers of religion”....

Chinese Creation story

Chinese Creation Myths

Chinese Creation Myths Chinese creation myths are symbolic narratives about the origins of the universe, earth, and life. In Chinese mythology, the term “cosmogonic myth” or “origin myth” is more accurate than “creation myth“, since very few stories involve a creator deity or divine will. Chinese creation myths fundamentally differ from monotheistic traditions with one authorized version,...