Pangenesis

Pangenesis is a biological hypothesis first proposed by Charles Darwin, which postulates that all cells in an organism contribute to the genetic material of its offspring. This theory, which was later disproven, was an early attempt to explain the mechanisms of heredity and genetic inheritance.

History

The concept of Pangenesis was first introduced by Charles Darwin in his book The Variation of Animals and Plants under Domestication published in 1868. Darwin proposed this theory as a hypothetical mechanism for heredity, in an attempt to explain how offspring could inherit traits from their parents.

Concept

According to the theory of Pangenesis, every part of the body produces its own type of small organic particles called "gemmules". These gemmules, as per Darwin's hypothesis, were believed to be capable of self-replication and could travel from every part of the body to the reproductive organs, where they could be incorporated into the gametes or sex cells. It was thought that the blending of these gemmules from the parents resulted in the traits of the offspring.

Criticism and Disproval

The theory of Pangenesis was widely criticized and eventually disproven. The main criticism was the lack of empirical evidence supporting the existence of gemmules. The final blow to the theory came with the rediscovery of Mendel's laws of inheritance at the turn of the 20th century, which provided a more accurate and predictive model of inheritance.

Legacy

Despite its inaccuracy, the theory of Pangenesis was significant in the history of genetics as it represented one of the first systematic attempts to explain the mechanism of heredity. It stimulated further research and discussion in the field, paving the way for the development of modern genetics.

See Also

• Genetics
• Heredity
• Charles Darwin
• Gregor Mendel

References

• Darwin, Charles (1868). The Variation of Animals and Plants under Domestication. London: John Murray.
• Mendel, Gregor (1866). Experiments on Plant Hybridization. Brno: Verhandlungen des naturforschenden Vereines.

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  Darwin's Pangenesis

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  Weismann's Germ Plasm