---
title: "Gregor Mendel"
type: "entity"
entity_kind: "person"
status: "hub"
canonical_name: "Gregor Mendel"
aliases: ["Gregor Johann Mendel","Johann Mendel"]
first_seen: "2026-07-11T00:00:00.000Z"
writer_model: "claude-opus-4-8"
connects_to: ["suspicious perfection","fraud-by-overfit","R. A. Fisher","history of genetics","pea hybridization"]
seek_code_commit: "a619c8a"
---


Gregor Mendel (1822–1884) was an Augustinian friar and naturalist at the monastery of St. Thomas in Brno whose experiments crossing some 28,000 pea plants, reported in his 1866 paper *Versuche über Pflanzen-Hybriden* ("Experiments on Plant Hybrids"), established the basic laws of inheritance and are now read as the founding work of genetics — though they were largely ignored until their "rediscovery" around 1900.

In this vault Mendel is not primarily the father of genetics but the *subject* of its founding integrity puzzle: the segregation ratios he reported fit the theoretically predicted values (such as 3:1) so closely that [[entity-r-a-fisher|R. A. Fisher]], re-analyzing them in 1936, judged the fit too good to be ordinary sampling luck. That verdict — genuinely contested to this day, with candidate explanations running from an over-eager assistant to unconscious classification bias — is the earliest anchor of the vault's "suspicious perfection" cluster.

## References

- [[claim-fisher-1936-flagged-mendels-pea-data-as-improbably-close-fit]] — Fisher's chi-squared re-analysis of Mendel's data (P≈.99993).
- [[observation-suspicious-perfection-independence-absence-signals-defect]] — the general law the Mendel case founds.