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Published on: August 24, 2013
On the internal dynamics of Mendelian genetics
1Department of Philosophy and Center for Science and Technology Studies, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0126, USA. rmburian@vt.edu
Summary
The early development of Mendelian genetics (1900-1930) was shaped by the "problem of the gene." Conflicting research on gene characteristics spurred interdisciplinary collaboration and discovery.
Area of Science:
- Genetics
- History of Science
Background:
- Examines the 'problem of the gene' in Mendelian genetics from 1900 to 1930.
- Focuses on conflicting claims regarding gene composition, location, and action by key researchers like Bateson and the Morgan group.
Discussion:
- Highlights how differing research programs and assumptions about genes created challenges.
- Explores how the need to resolve these conflicts drove geneticists to integrate knowledge from other scientific fields.
Key Insights:
- The 'problem of the gene' was a central, unifying challenge that transcended individual research programs.
- Conflicting viewpoints necessitated a broader, interdisciplinary approach to understanding the gene.
Outlook:
- The resolution of these conflicting views significantly influenced the trajectory of genetic research.
- This period of intense debate and integration provided the impetus for numerous subsequent discoveries in genetics.
Related Concept Videos
01:20Monohybrid Crosses
Overview
01:49Law of Segregation
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.
02:03Law of Independent Assortment
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.
01:39Chromosomal Theory of Inheritance
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.”
01:20Monohybrid Crosses
Overview
02:03Law of Independent Assortment
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.