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Carl Nägeli
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Carl Wilhelm von Nägeli was a Swiss botanist. He studied cell division and pollination but became known as the man who discouraged Gregor Mendel from further work on genetics. He rejected natural sele
Carl Wilhelm Nägeli
Carl Wilhelm Nägeli
Orthogenesis
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Orthogenesis is an obsolete biological hypothesis that organisms have an innate tendency to evolve in a definite direction towards some goal, due to some internal mechanism or "driving force". Accordi
Carl Nägeli
…known as the man who discouraged Gregor Mendel from further work on genetics. He rejected natural selection as a mechanism of evolution, favouring orthogenesis, though the term was only coined in 1893, two years after his death, driven by a supposed "inner perfecting principle". Carl Nägeli was born the son…
Theodor Eimer was the first to define orthogenesis.
Theodor Eimer was the first to define orthogenesis.
The mediaeval great chain of being as a staircase, implying the possibility of progress: Ramon Lull's Ladder of Ascent and Descent of the Mind, 1305
The mediaeval great chain of being as a staircase, implying the possibility of progress: Ramon Lull's Ladder of Ascent and Descent of the Mind, 1305
Reviewing Darwin's Origin of Species, Karl Ernst von Baer argued for a directed force guiding evolution.
Reviewing Darwin's Origin of Species, Karl Ernst von Baer argued for a directed force guiding evolution.
Henry Fairfield Osborn's 1934 version of orthogenesis, aristogenesis, argued that aristogenes, not mutation or natural selection, created all novelty.
Henry Fairfield Osborn's 1934 version of orthogenesis, aristogenesis, argued that aristogenes, not mutation or natural selection, created all novelty. Osborn supposed that the horns of Titanotheres evolved into a baroque form, way beyond the adaptive optimum.