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Romanes' 1892 copy of Ernst Haeckel's allegedly fraudulent embryo drawings (this version of the figure is often attributed incorrectly to Haeckel). [1]Haeckel's illustrations show vertebrate embryos at different stages of development, which exhibit embryonic resemblance as support for evolution, recapitulation as evidence of the Biogenetic Law, and phenotypic divergence as evidence of von Baer ...
The theory of recapitulation, also called the biogenetic law or embryological parallelism—often expressed using Ernst Haeckel's phrase "ontogeny recapitulates phylogeny"—is an historical hypothesis that the development of the embryo of an animal, from fertilization to gestation or hatching (), goes through stages resembling or representing successive adult stages in the evolution of the ...
Ernst Heinrich Philipp August Haeckel (German: [ɛʁnst ˈhɛkl̩]; 16 February 1834 – 9 August 1919) [ 1 ] was a German zoologist, naturalist, eugenicist, philosopher, physician, professor, marine biologist and artist. He discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms and coined ...
von Baer's laws (embryology) Embryology theories of Ernst Haeckel (following Meckel) and Karl Ernst von Baer compared. Von Baer denied any recapitulation of whole adult forms, though individual structures might be recapitulated. In developmental biology, von Baer's laws of embryology (or laws of development) are four rules proposed by Karl ...
Haeckel's drawings, reproduced by G.J. Romanes in 1892. Early embryologists, including Haeckel and von Baer, noted that embryos of different animals pass through a similar stage in which they resemble one another very closely. Karl Ernst von Baer, whose third law of embryology gave the basis for the idea of the phylotypic stage
Embryology theories of Ernst Haeckel, who argued for recapitulation [2] of evolutionary development in the embryo, and Karl Ernst von Baer's epigenesis. A recapitulation theory of evolutionary development was proposed by Étienne Serres in 1824–26, echoing the 1808 ideas of Johann Friedrich Meckel.
For example, German biologist and philosopher Ernst Haeckel proposed that all organisms went through a "re-run" of evolution he said that 'ontogeny repeats phylogeny' while in development. Haeckel believed that to become a mammal , an embryo had to begin as a single-celled organism, then evolve into a fish, then an amphibian, a reptile, and ...
Ernst Haeckel supposed that embryonic development recapitulated an animal's phylogeny, and introduced heterochrony as an exception for individual organs. Modern biology agrees instead with Karl Ernst von Baer's view that development itself varies, such as by changing the timing of different processes, to cause a branching phylogeny.