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- Drawing a number of conclusions from his work on developing embryos, von Baer emphasized that development is epigenetic, proceeding from homogeneous to heterogeneous matter, which he felt made preformationist ideas no longer plausible. He encapsulated his thinking into four statements that are now known as “von Baer’s Laws.”
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Mechanisms: the processes of evolution – Selection, mutation, migration, and more; Microevolution – Evolution within a population; Speciation – How new species arise; Macroevolution – Evolution above the species level; The big issues – Pacing, diversity, complexity, and trends; Teach Evolution. Lessons and teaching tools. Teaching ...
Apr 15, 2014 · Von Baer's laws of embryology provided a framework to research the relationships and patterns between the development of different classes of organisms, and the patterns between this development and the diversification of species on Earth (phylogeny).
Together with Heinz Christian Pander and based on the work by Caspar Friedrich Wolff, he described the germ layer theory of development ( ectoderm, mesoderm, and endoderm) as a principle in a variety of species, laying the foundation for comparative embryology in the book Über Entwickelungsgeschichte der Thiere (1828).
ABSTRACT The research program of Karl Ernst von Baer (1792-1876) intended to enhance the com - parative approach of animal classification by demonstrating vertebrate affinities (homology). Baer visualized his ideas on development and evolution with an unpublished figure of a branching tree.
Abstract. The research program of Karl Ernst von Baer (1792-1876) intended to enhance the comparative approach of animal classification by demonstrating vertebrate affinities (homology). Baer visualized his ideas on development and evolution with an unpublished figure of a branching tree.
von Baer's law for the ages: lost and found principles of developmental evolution. Highlights. •. I provide a historical overview of key ideas preceding von Baer's law. •. I describe the most important findings made by Karl von Baer as an embryologist and their impact on other important thinkers of his time. •.
Karl Ernst von Baer was a Prussian-Estonian embryologist who discovered the mammalian ovum and the notochord and established the new science of comparative embryology alongside comparative anatomy. He was also a pioneer in geography, ethnology, and physical anthropology.
