Darwinism is the foundational theory explaining how life on Earth diversifies through natural selection.
In short: Charles Darwin proposed that evolution is driven by natural selection, a process where individuals with advantageous traits survive and reproduce more successfully. While his original 19th-century explanation was incomplete, it remains the keystone of modern biology, connecting every living creature through a vast, ancient, and shared evolutionary history.
Darwinism describes the mechanism of biological evolution, primarily driven by natural selection. The theory posits that life forms change over successive generations, with diversity emerging as lineages diverge from common ancestors. Darwin argued that organisms possess specific functional features—like eyes or wings—that arise because individuals with more useful traits are better equipped to survive and produce progeny. This process of descent with modification explains the staggering heterogeneity of life, from microscopic bacteria to massive sequoias.
The 19th-century naturalist Charles Darwin provided a scientific explanation that was essentially correct but lacked a mechanism for inheritance. He was unaware of the work of Gregor Mendel, and consequently, his understanding of heredity remained vague. This gap led to an 'eclipse of Darwinism' between the 1880s and 1920s, during which scientists explored alternative, ultimately untenable, evolutionary mechanisms. The theory was later revived and updated through the modern synthesis, which integrated Darwin’s natural selection with Mendelian genetics and population genetics.
Since the 1960s, molecular biology has transformed our understanding of evolutionary history. Scientists can now analyze DNA and proteins to reconstruct the lineage of life with remarkable precision. For instance, we know that humans and chimpanzees share about 98 to 99 percent of their genetic units. All plants and animals derive from microorganisms that originated more than 3 billion years ago, while mammals, birds, and fishes share aquatic ancestors from 600 million years ago. Today, the focus of evolutionary science has shifted from proving the fact of evolution to extracting detailed knowledge from the vast information stored in the biological record.
The term 'Darwinism' itself has a complex history. Coined by Thomas Henry Huxley in April 1860, it was initially used to describe evolutionary concepts broadly. While the public continues to use the term to refer to modern evolutionary theory, many scientists argue it is now an inappropriate label given the significant theoretical developments that have occurred since Darwin’s time. Furthermore, the term is sometimes used pejoratively by creationists to conflate biological evolution with scientific materialism or to challenge the scientific consensus on the origins of life.
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Sources
- Summary by Intellect · source: Darwinism | Definition & Facts | Britannica
- Also: Darwinism
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