According to Haeckel's biogenetic [CPMT CPMT 77, 79]a)Development of individual metazoanshown embryonic characters of ancestors.b)Ontogeny repeats phylogeny c)Germplasm is immportald)Every organisms is produced by its parents Correct answer is option 'B'. Can you explain this answer?

Question

According to Haeckel's biogenetic                [CPMT CPMT 77, 79]a)Development of individual metazoanshown embryonic characters of ancestors.b)Ontogeny repeats phylogeny c)Germplasm is immportald)Every organisms is produced by its parents Correct answer is option 'B'. Can you explain this answer?

Answer

The theory of recapitulation, also called as the biogenetic law or embryological parallelism often expressed in Ernst Haeckel's phrase 'ontogeny recapitulates phylogeny' is a largely discredited biological hypothesis that in developing from embryo to adult, animals go through stages resembling or representing successive stages in the evolution of their remote ancestors. While examples of embryonic stages show that molecular features of ancestral organisms exist, the theory of recapitulation itself has been viewed within the field of developmental biology as a historical side-note rather than as dogma. Thus, correct answer is option B.

Answer

Ontogeny recapitulates Phylogeny” or otherwise known as “Ontogeny repeats Phylogeny” is a heredity theory given by Ernst Haeckel.

Answer

The Correct Answer is Option 'B': Ontogeny repeats phylogeny

Explanation:

Haeckel's biogenetic law, also known as the recapitulation theory, suggests that the development of an individual organism (ontogeny) mirrors the evolutionary history of its species (phylogeny). According to this theory, the stages of development an organism goes through during its embryonic development are representative of the ancestral forms that its species has evolved from.

Ontogeny: The development of an individual organism from fertilization to birth or hatching.

Phylogeny: The evolutionary history and relationships of a species or group of organisms.

Key Points:

1. Embryonic Characters: According to Haeckel, during the embryonic development of metazoans (multicellular animals), various characteristics or structures can be observed that resemble those of their ancestors. These embryonic characters may include physical features, such as gill slits in human embryos, which are reminiscent of the ancestral fish-like organisms.

2. Repetition of Evolutionary History: The phrase 'ontogeny repeats phylogeny' means that the stages of development an organism goes through during its embryonic development recapitulate or repeat the evolutionary history of its species. This means that the early stages of development resemble the ancestral forms and then gradually transform into the adult form of the species.

3. Developmental Homologies: Haeckel believed that the similarities observed during embryonic development among different species are evidence of their shared evolutionary ancestry. For example, the similarities between the embryos of different vertebrates, such as humans, chickens, and fish, suggest a common ancestry and evolutionary relationship.

4. Evolutionary Transformation: Haeckel's theory suggests that during embryonic development, organisms undergo transformations that reflect the changes that occurred during the course of evolution. These transformations may include the loss or modification of ancestral structures and the development of new structures that are characteristic of the adult form of the species.

Conclusion:

In summary, Haeckel's biogenetic law proposes that the development of an individual organism mirrors the evolutionary history of its species. The stages of development an organism goes through during its embryonic development exhibit characters that resemble those of its ancestors. This idea is captured by the phrase 'ontogeny repeats phylogeny,' which highlights the repetition of evolutionary history during development.

Answer

The biogenetic law is a theory of development and evolutionproposed by Ernst Haeckel in Germany in the 1860s. It is one of several recapitulation theories, which posit that the stages of development for an animal embryo are the same as other animals' adult stages or forms. Commonly stated as ontogeny recapitulates phylogeny, the biogenetic lawtheorizes that the stages an animal embryo undergoes during development are a chronological replay of that species' past evolutionary forms. ................so option (b) is right. I hope it will help u :)

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