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Why was Darwin unable to use Gregor Mendel’s discoveries to explain heredity?

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blue wildebeests — Zoology Blue wildebeests (*Connochaetes taurinus*) drinking at the water's edge, Masai Mara, Kenya.

Charles Darwin was unable to use Gregor Mendel’s discoveries because they remained unknown to him during his lifetime. Mendel published his findings on the principles of heredity in 1866, but the work was largely ignored by the scientific community for 35 years.12

The lack of awareness regarding Mendel’s work was due to several factors:
* Lack of Endorsement: The influential botanist Karl Wilhelm von Nägeli failed to recognize the significance of Mendel’s research, which hindered its widespread acceptance.2
* Scientific Context: At the time, the processes of mitosis and meiosis were unknown, and little was understood about the cell, making it difficult for contemporaries to appreciate the mechanism of particulate inheritance.2
* Rediscovery: Mendel’s work was not rediscovered until 1900, when other scientists independently arrived at similar conclusions.231

Consequently, Darwin relied on the prevailing, yet flawed, theory of "blending inheritance," which suggested that offspring were an average of their parents' traits. This model failed to explain how variations were preserved over generations, a critical gap that Mendelian genetics would eventually fill.1