Today, Neo-Darwinism is a topic that generates great interest and debate in society. For years, Neo-Darwinism has been the object of study, analysis and reflection by experts and scientists in different areas. Its relevance has been reflected in numerous studies, conferences and publications that seek to understand its impact and scope in different contexts. Neo-Darwinism is a topic that crosses borders and reaches people of different ages, genders, cultures and nationalities, generating an enriching dialogue that allows us to understand it from different perspectives. In this article, we will delve into the world of Neo-Darwinism, exploring its origin, evolution and consequences in today's society. Through interviews, analysis and testimonies, we will give a voice to those who have been impacted by Neo-Darwinism and delve into its global implications.
Neo-Darwinism is generally used to describe any integration of Charles 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 August Weismann's theories of evolution) or 1942 ("modern synthesis"), but it can mean any new Darwinian- and Mendelian-based theory, such as the current evolutionary theory.
Darwin's theory of evolution by natural selection, as published in 1859, provided a selection mechanism for evolution, but not a trait transfer mechanism. Lamarckism was still a very popular candidate for this. August Weismann and Alfred Russel Wallace rejected the Lamarckian idea of inheritance of acquired characteristics that Darwin had accepted and later expanded upon in his writings on heredity.: 108 The basis for the complete rejection of Lamarckism was Weismann's germ plasm theory. Weismann realised that the cells that produce the germ plasm, or gametes (such as sperm and eggs in animals), separate from the somatic cells that go on to make other body tissues at an early stage in development. Since he could see no obvious means of communication between the two, he asserted that the inheritance of acquired characteristics was therefore impossible; a conclusion now known as the Weismann barrier.
It is, however, usually George Romanes who is credited with the first use of the word in a scientific context. Romanes used the term to describe the combination of natural selection and Weismann's germ plasm theory that evolution occurs solely through natural selection, and not by the inheritance of acquired characteristics resulting from use or disuse, thus using the word to mean "Darwinism without Lamarckism."
Following the development, from about 1918 to 1947, of the modern synthesis of evolutionary biology, the term neo-Darwinian started to be used to refer to that contemporary evolutionary theory.
Biologists, however, have not limited their application of the term neo-Darwinism to the historical synthesis. For example, Ernst Mayr wrote in 1984 that:
Publications such as Encyclopædia Britannica use neo-Darwinism to refer to current-consensus evolutionary theory, not the version prevalent during the early 20th century. Similarly, Richard Dawkins and Stephen Jay Gould have used neo-Darwinism in their writings and lectures to denote the forms of evolutionary biology that were contemporary when they were writing.
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