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In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
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Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
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Beyond Mendelism and Biometry.

Yafeng Shan1

  • 1Department of Philosophy, School of European Culture and Languages, University of Kent, Canterbury, CT2 7NZ, UK.

Studies in History and Philosophy of Science
|August 29, 2021
PubMed
Summary
This summary is machine-generated.

The traditional Mendelian-Biometrician framework for early genetics history is inadequate. This distinction overlooks the field's true theoretical and methodological diversity, hindering a complete understanding of genetics' development.

Keywords:
BiometryDarbishireHeredityMendelismVariationWeldonYule

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Area of Science:

  • Genetics
  • History of Science
  • Historiography

Background:

  • Early 20th-century genetics development is often analyzed through the Mendelian-Biometrician controversy.
  • Extensive research has focused on the controversy's origins, nature, and impact.

Observation:

  • The Mendelian-Biometrician dichotomy is increasingly seen as an insufficient lens.
  • This traditional framework may not accurately represent the diverse scientific approaches of the era.

Findings:

  • This paper challenges the utility of the Mendelian-Biometrician distinction in historical analyses.
  • The distinction fails to capture the theoretical and methodological heterogeneity within early genetics.
  • Relying on this binary hinders a comprehensive understanding of genetics' formative years.

Implications:

  • Re-evaluating historiographical frameworks is crucial for accurate scientific history.
  • A more nuanced approach is needed to understand the complex development of genetics.
  • This challenges established narratives in the history of genetics.