Ad
related to: karl ernst von baer
Search results
Results from the WOW.Com Content Network
Baer Island in the Kara Sea was named after Karl Ernst von Baer for his important contributions to the research of arctic meteorology between 1830 and 1840. [30] A duck, Baer's pochard, was also named after him. Statue of Karl Ernst von Baer on Toome Hill, Tartu: As a tradition, students wash the statue's head with champagne every Walpurgis ...
In developmental biology, von Baer's laws of embryology (or laws of development) are four rules proposed by Karl Ernst von Baer to explain the observed pattern of embryonic development in different species. [1] von Baer formulated the laws in his book On the Developmental History of Animals (German: Über Entwickelungsgeschichte der Thiere ...
Embryology theories of Ernst Haeckel, who argued for recapitulation [3] 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.
Ernst Haeckel, along with Karl von Baer and Wilhelm His, are primarily influential in forming the preliminary foundations of 'phylogenetic embryology' based on principles of evolution. [4] Haeckel's 'Biogenetic Law' portrays the parallel relationship between an embryo's development and phylogenetic history.
The theory was widely supported in the Edinburgh and London schools of higher anatomy around 1830, notably by Robert Edmond Grant, but was opposed by Karl Ernst von Baer's ideas of divergence, and attacked by Richard Owen in the 1830s. [6] George Romanes's 1892 copy of Ernst Haeckel's controversial embryo drawings [a] [7]
von Baer's laws, discovered by Karl Ernst von Baer, state that embryos start from a common form and develop into increasingly specialised forms, so that the diversification of embryonic form mirrors the taxonomic and phylogenetic tree. Therefore, all animals in a phylum share a similar early embryo; animals in smaller taxa (classes, orders ...
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 is modified by natural selection , such as by changing the timing of different processes, to cause a ...
His work in embryology was continued by Karl Ernst von Baer (1792-1876), who expanded Pander's concept of germ layers to include all vertebrates. Pander performed important studies in the field of paleontology , being known for his extensive research on fossils found in the Devonian and Silurian geological strata of the Baltic regions.
Ad
related to: karl ernst von baer