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?
- Mindfulness Is Not A Waste Of Time
- Low Hormone Levels Linked To Obesity In Teens
- Silencing Cholera's Social Media
- How Did The Giraffe Get Its Long Neck? Clues Now Revealed By New Genome Sequencing
- Malnutrition Results From More Than Just Inadequate Diet
- Catching The 750 GeV Boson With Roman Pots ?!
- Prohibition 2016: Assessing The UK's Psychoactive Substances Act
- "Correction, I say that 20 kg of algae solution was needed per person to provide all the oxygen..."
- "Very interesting article Edzard. Not that I disagree with you and those who commented, I would..."
- "Great article about a great study. What is known of African American history jibes with this..."
- "Sweet simple and to the point. The anti sexual harassment training could begin and end right..."
- "Am I correct when I state virus can exchange certain molecules with other virus? If that is the..."
- Our Audience Is Up 700% – And Anti-Science Groups Are Going Nuts
- Tiny Vampires of the Ancient Seas
- Incentivizing Antibiotic Research
- Party Drug for Post-Surgical Pain Prevention
- Hey De Blasio-Get Off Your Sodium Podium!
- The Name Game: How Unethical Environmental Groups and Toxic Fanatics Scare You With Words
- Wind turbines on Galapagos replace millions of liters of diesel since 2007, meet 30 percent of energy needs
- Study shows patients require less painkilling medication after breast-cancer surgery if they have opiate-free anesthesia
- Quiet please in the intensive care unit!
- Premature babies may grow up to have weaker bones
- 90-90-90 HIV initiative would yield 'extraordinary returns' in South Africa