Mendel solved the logic of inheritance in his monastery garden with no more technology than Darwin had in his garden at Down House, so why couldn't Darwin have done it too? A Journal of Biology article argues that Darwin's background, influences and research focus gave him a viewpoint that prevented him from interpreting the evidence that was all around him, even in his own work.
Moravian priest and scientist Gregor Mendel (1822 - 1884) studied clear-cut, inherited traits in pea plants, which he grew in the monastery gardens in Brno. Mendel showed that trait inheritance follows simple laws, and 'Mendels Laws Of Inheritance' (1) were later named after him. Mendel's work was rediscovered at the beginning of the 20th century, and laid the foundations for genetics.
Mendel had a good understanding of biology and Darwin had an outstanding one. So why didn't Darwin become the "father of modern genetics"? Mendels understanding of physics, statistics and probability theory were far superior to Darwin's, argues Jonathan Howard of the University of Cologne, Germany. And Darwin's commitment to quantitative variation as the raw material of evolution meant he could not see the logic of inheritance.
"Quantitative variation was at the heart of Darwin's evolution, and quantitative variation is the last place where clean Mendelian inheritance can be seen," says Howard. "Darwin boxed himself in, unable to see the laws of inheritance in continuous variation, unable to see the real importance of discontinuous variation where the laws of inheritance could be discerned."
Darwin's view of biology was greatly influenced by geologist Charles Lyell during and after the 1831-1836 Beagle voyage, leading to Darwin's focus on infinitely tiny differences between individuals giving infinitesimal advantages or disadvantages in survival. For Darwin, selection of these variants over hundreds of thousands of generations was the critical process in evolution.
Darwin's book The Different Forms of Flowers on Plants of the Same Species details breeding experiments involving a well-defined "unit" character, yielding clear data interpretable as 'Mendelian' ratios. But these went unremarked by Darwin, who insisted, because of his belief that only quantitative variation contributed to evolution, that the rules of inheritance were too complex and not ready for definitive analysis.
Heredity and variation played central roles in Darwin's development of the theory of evolution by natural selection. His view that variation is caused by random, quasi-physical events outside environmental control, is much as we believe today. But he never freed himself from the incorrect belief that environmentally determined changes could also be inherited, another victim of his focus on quantitative characters, height, weight and so on, which are strongly influenced by environmental effects.
This year marks the bicentennial of Darwin's birthday, and 150 years since "Origin of Species" was first published. For more articles from all over the world, check out Darwin Day 2009 and 30 Days of Evolution Blogging at Adaptive Complexity.
Article: Why didn't Darwin discover Mendel's laws?, Jonathan C Howard, Journal of Biology 2009, 8:15
(24 February 2009)
(1) Two generalizations, the Law of Segregation and the Law of Independent Assortment
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Part I: Bee Deaths Mystery Solved? Neonicotinoids (Neonics) May Actually Help Bee Health
- Bitcoin And Anonymity: User's Identity Can Be Revealed Much Easier Than Thought
- Part II: Bee Deaths And CCD - Flawed Chensheng Lu Harvard Studies Endanger Bees
- Violence, Sex And Taboo: The Original Brothers Grimm Fairy Tales Back In Print
- Volunteer-Based Peer Review: A Success
- Diversity Fatigue: Why Businesses Struggle To Close The Gender Gap
- Reasons Serious Scientists Should Not Fear The Winnower and other OA Open Review Journals.
- "At three weeks into testing using these concentrations, the health of the bee colonies was positively..."
- "As someone who has received NIH funding, I can tell you the answer is magic and pure coincidence..."
- "I never thought of diminutive as having a positive or negative association. I often describe people's..."
- "For the most part, I found your article compelling. It reminded me of the time in graduate school..."
- "Indeed, my little experiment does not prove anything; it is not scalable. Not the $10, not the..."
- Why do people with autism see faces differently?
- Endangered hammerhead shark found migrating into unprotected waters
- Female color perception affects evolution of male plumage in birds
- Diagnosing deafness early will help teenagers' reading development
- 'Utter neglect' of rheumatic heart disease revealed by results from global study