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Mendel and the laws of inheritance

This page delivers no verdict; it presents claims and evidence with their sources. No theory in science is absolute. Method

For everyone

Working in a monastery in Brno, Mendel showed with pea crosses that traits pass from generation to generation as discrete "units" rather than by blending. His work went largely unnoticed until it was rediscovered in 1900. The statistician Fisher later argued that Mendel's data were "too good" to be expected.

For specialists

Mendel reported roughly 3:1 dominant/recessive ratios in the F2 generation for seven characters, and independent assortment. Fisher (1936) calculated with χ² that the combined data lacked the expected scatter, the probability of such good agreement by chance being about 0.00007. Later work (Franklin et al. 2008) discussed various explanations, including unconscious classification bias, an assistant's intervention and flaws in Fisher's own assumptions.

Claims

Hereditary traits are transmitted by non-blending units that occur in pairs and separate during gamete formation.^[1]

Evidence

Supporting

Experiment

In thousands of pea plants the dominant and recessive traits were counted appearing in roughly a 3:1 ratio in the second generation.^[1]

Challenging

Statistics / meta-analysis

It was argued that the data fit the theoretical ratios more closely than chance would allow, lacking the random scatter expected.^[2][3]

Connections

Parent

Biology

Built upon by

The modern synthesis (neo-Darwinism)

Darwin and Wallace, natural selection

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Sources

ArticleMendel, G. (1866). Versuche über Pflanzen-Hybriden. Verhandlungen des naturforschenden Vereines in Brünn 4, 3–47
ArticleFisher, R. A. (1936). Has Mendel's work been rediscovered?. Annals of Science 1(2), 115–137DOI 10.1080/00033793600200111 archive
BookFranklin, A.; Edwards, A. W. F.; Fairbanks, D. J.; Hartl, D. L.; Seidenfeld, T. (2008). Ending the Mendel–Fisher Controversy. University of Pittsburgh Press

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Cite this page

APA

Athena contributors. (2026). Mendel and the laws of inheritance. Athena: The tree of human knowledge. Retrieved November 1, 2026, from https://latifkedi.github.io/athena/en/d/mendel/

BibTeX

@misc{athena_mendel,
  title        = {Mendel and the laws of inheritance},
  author       = {{Athena contributors}},
  year         = {2026},
  howpublished = {\url{https://latifkedi.github.io/athena/en/d/mendel/}},
  note         = {Athena: The tree of human knowledge. Accessed: 2026-11-01}
}

Added: September 27, 2026 · Last changed: September 27, 2026 · Page history

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