German biologist and naturalist Ernst Haeckel disagreed with Karl Ernst von Baer

Question

German biologist and naturalist Ernst Haeckel disagreed with Karl Ernst von Baer and further expanded on the Meckel-Serres law with his biogenetic law. What does the biogenetic law claim? Evolutionarily novel traits tend to appear late in development and are good diagnostics for separating closely related species bTraits that appear early on in development are extremely resistant to evolutionary change, and hence they are very similar across many taxa. CThe developmental progress of an organism (its ontogeny) recapitulates its evolutionary history (its phylogeny). d Embryos display characteristics of embryos from species that preceded them on the scala naturae

Explanation / Answer

Biogenetic law by Ernst Haeckel:

This is the theory which states that an organism during its embryonic stages resembles the past evolution from which the organism has evolved.

Meckel - Serres law:

Karl von Baer:

Karl von Baer studied the embryonic development of animals. He was the one who discovered blastula, and development of notochord. He described the embryonic development from germ layer ectoderm, endoderm and mesoderm.

Baer’s law of embryology states that:

Question:

German biologist and naturalist Ernst Haeckel disagreed with Karl Von Baer and further expanded on Meckel-Serres law with his biogenetic law, what does the biogenetic law claim?

Answer:

The development progress of an organism (its ontogeny) recapitulates its evolutionary history (its phylogeny)

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