NEET Biology Evolution : Biogenetic Law | Summary and Q&A

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April 6, 2017
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NEET Biology Evolution : Biogenetic Law

TL;DR

Organisms repeat ancestral history during the stages of their life cycle, as shown through examples of frog and chordate development.

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Key Insights

  • 🙈 The biogenetic law states that organisms repeat ancestral history during their development, as seen through ontogeny repeating phylogeny.
  • 👥 Ontogeny focuses on the life history of individual organisms, while phylogeny focuses on the evolutionary history of a group of organisms.
  • 🐸 Examples like the development of a tadpole into a frog and a chordate into a hagfish demonstrate the repetition of ancestral history during an organism's life cycle.
  • 👮 Baer's law, originally named after Johann Friedrich von Baer, was later renamed as the biogenetic law by Ernst Haeckel.
  • 👮 The biogenetic law helps us understand the evolutionary relationships between different organisms and the development of specific traits over time.
  • ❓ The study of ontogeny and phylogeny provides insights into the origins and development of organisms.
  • 🏍️ Organisms show resemblances to their evolutionary ancestors at certain stages of their life cycle, reflecting their ancestral history.

Transcript

hello friends this video on eat evolution is brought to you by exam fear calm normal fear from and what does biogenetic law so this law in simple word states that ando cheney repeats fight oh Jenny so what do we mean by Ponticelli so on oh Jenny is that branch of science which deals with the study of life history of an organism that is how an organ... Read More

Questions & Answers

Q: What is the difference between ontogeny and phylogeny?

Ontogeny refers to the life history of an individual organism, while phylogeny refers to the evolutionary history of a group of organisms.

Q: How does an organism repeat its ancestral history during its development?

As an organism goes through its life cycle, it exhibits traits and characteristics that resemble its evolutionary ancestors at certain stages, demonstrating the repetition of ancestral history.

Q: Why was the biogenetic law renamed as such by Ernst Haeckel?

The biogenetic law was originally called the Baer's law after scientist Johann Friedrich von Baer, but it was renamed by Ernst Haeckel to better reflect its principles.

Q: Can you provide an example of how ontogeny repeats phylogeny?

The development of a tadpole into a frog shows the resemblance to fish-like characteristics during the tadpole stage, demonstrating the evolutionary connection between frogs and fishes.

Summary & Key Takeaways

  • Biogenetic law states that organisms repeat their ancestral history during their development, which is known as ontogeny.

  • Ontogeny focuses on the life history of an individual organism, while phylogeny focuses on the evolutionary history of a group of organisms.

  • Developmental stages, such as the tadpole stage in frogs or the chordate stage in hagfish, show resemblances to evolutionary ancestors.

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