The curious case of blending inheritance.

Area of Science:

• Genetics
• History of Biology
• Evolutionary Biology

Background:

• The historical narrative of genetics often centers on Gregor Mendel's pea experiments, establishing the concept of particulate inheritance.
• This narrative frequently contrasts Mendelism with 'blending' inheritance, portraying them as opposing theories.

Observation:

• Historians often misinterpret the early 20th-century conflict between biometricians and Mendelians as a debate between blending and particulate inheritance.
• Francis Galton's work distinguished between blended and alternate inheritance as breeding outcomes, not competing mechanisms.

Findings:

• The distinction between blending and particulate inheritance was not a central theoretical conflict in early genetics.
• Few biologists at the time proposed blending as a mechanism; it was primarily a description of breeding results.
• Statistical methods and models were foundational to evolutionary genetics from its earliest stages.

Implications:

• Revisiting the history of genetics reveals a more complex interplay of ideas than the traditional Mendelian vs. biometrician narrative suggests.
• Statistical approaches were crucial to the development of evolutionary genetics, predating the modern evolutionary synthesis.