According to recapitulation theory[NCERT 75, CPMT 82]a)Every animal begins as an eggb)Damaged body parts are formed newc)Offsprings are like parentsd)Ontogeny repeats phylogenyCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

The theory of recapitulation also cld the biogenetic law or embryological parallelism given by Ernst Haeckel. He use the phrase 'ontogeny recapitulates phylogeny' means the development of the embryo of an animal from fertilization to gestation or hatching (ontogeny) follows the ancestral stages ( phylogeny).

Answer

This theory was proposed by Ernest Haeckel ...ontogeny repeats phylogeny..means developmental history of an organism repeats evolutionary history of its  ancestors .. i hope it will helps..

Answer

Recapitulation Theory:
The recapitulation theory, also known as the biogenetic law or embryological parallelism, was proposed by Ernst Haeckel in the 19th century. According to this theory, the development of an individual organism (ontogeny) recapitulates or repeats the evolutionary history of its species (phylogeny).

Explanation:
The correct answer to the given question is option 'D' - Ontogeny repeats phylogeny. Let's understand why this is the correct answer:

Ontogeny:
Ontogeny refers to the development of an individual organism from the zygote stage to its fully mature form. It includes all the stages of growth and differentiation that an organism goes through during its lifetime.

Phylogeny:
Phylogeny refers to the evolutionary history and relationships among different species. It represents the branching pattern of evolutionary relationships, showing how different species are related to each other through common ancestors.

Recapitulation Theory:
According to the recapitulation theory, the development of an individual organism during its ontogeny follows a series of stages that resemble the evolutionary stages of its ancestors during phylogeny. In other words, the development of an individual organism repeats the evolutionary history of its species.

Examples of Recapitulation:
1. Gill Slits: During the early stages of development in human embryos, gill slits are formed. These gill slits resemble the gill arches found in fish embryos. This similarity suggests a common evolutionary ancestor between humans and fish.

2. Tail Formation: Human embryos also have a tail-like structure during early development. This tail resembles the tails found in other vertebrate embryos, such as reptiles and other mammals. This similarity suggests a common evolutionary ancestor between humans and these animals.

3. Limb Development: The development of limbs in different vertebrate embryos follows a similar pattern, with the formation of limb buds and subsequent growth and differentiation. This similarity suggests a common evolutionary origin of limbs in vertebrates.

Conclusion:
The recapitulation theory states that the development of an individual organism during its ontogeny reflects the evolutionary history of its species during phylogeny. The presence of structures and developmental stages in embryos that resemble those of ancestral species supports this theory. Therefore, the correct answer to the given question is option 'D' - Ontogeny repeats phylogeny.

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