Assisted evolution
Human intervention to accelerate natural evolutionary processes.
Wikipedia / Wikimedia Commons
Assisted evolution, also called human-assisted evolution, involves deliberate human intervention to speed up natural evolutionary processes. The aim is to help species adapt to shifting environments faster than natural selection alone would allow. This approach can boost food production and crop yields, and help targeted species develop resistance to serious threats more quickly. People have practiced assisted evolution for thousands of years, mainly for commercial and business reasons. In recent times, it has gained public attention for noncommercial uses, especially species conservation. The most notable noncommercial application is the effort to protect coral reefs from rising ocean temperatures and other climate change effects.
**History**
**Commercial purposes** For thousands of years, assisted evolution has been used for commercial and business ends. Selective breeding of Asian wolves by hunter-gatherers over 30,000 years ago led to modern dog breeds like the German Shepherd, now used for disability assistance, search-and-rescue, and police and military work. Plant breeding has also benefited from techniques such as Rapid Generation Advance (RGA) and single-seed descent, which accelerate natural selection. Assisted evolution in plants has increased food production and reduced pesticide use, helping to lower global poverty and malnutrition. More recently, it is used to breed animals with higher muscle or fat content and greater resistance to harmful bacteria and other pathogens.
**Noncommercial purposes** Gregor Mendel famously used assisted evolution for noncommercial purposes, discovering genes and alleles and their effects on offspring genotype. In recent years, assisted evolution has entered the public spotlight for conservation. The most prominent noncommercial application is the attempt to save coral reefs from rising ocean temperatures. Assisted evolution is seen as a temporary measure to help many threatened species cope with global warming and other climate-related environmental changes.
**Types**
**Stress conditioning** Stress conditioning involves exposing organisms to sublethal stress to trigger physiological changes that boost tolerance to future stress events. Some of these changes can be passed down through generations in both plants and animals. In a lab, stress conditioning can be artificially induced to create desired responses ba
- field
- Evolutionary biology, conservation biology, agriculture
- known_for
- Accelerating natural evolutionary processes through human intervention
- commercial_use
- Selective breeding, plant breeding, increased food production
- noncommercial_use
- Species conservation, notably coral reef preservation
Lore & Background
Assisted evolution has been practiced for thousands of years for commercial and business purposes. Selective breeding of Asian wolves over 30,000 years ago by hunter-gatherers allowed for the creation of modern breeds such as the German Shepherd, which are used often for disability assistance, search-and-rescue, and police and military roles. Plant breeding has also benefitted from Rapid Generation Advance (RGA) and single-seed descent to speed up the process of natural selection. Assisted evolution in plants has allowed for increased food production and reduced pesticide use, yielding a decrease in global poverty and malnutrition. Most recently, assisted evolution is being used to breed animals with a higher muscle or fat content, as well as have a higher resistance to harmful bacteria and other pathogens.
Assisted evolution for non-commercial purposes was famously used by Gregor Mendel, who discovered the presence of genes and alleles, as well as their impact on an offspring's genotype. Assisted evolution has come into the public eye for noncommercial purposes such as conservation in recent years. Assisted evolution for noncommercial purposes is most notably practiced in the attempt to save coral reefs from rising ocean temperatures. Assisted evolution is believed to be a temporary solution to save many threatened species from global warming and other climate change related environmental changes.
Reader's Guide
Assisted evolution represents a significant shift in how humans interact with natural selection, offering a tool to address both commercial needs and conservation challenges. For thousands of years, it has been used commercially to increase food production, reduce pesticide use, and breed animals with desirable traits such as higher muscle content or disease resistance. In recent years, its noncommercial applications have gained attention, particularly in conservation efforts to protect coral reefs from rising ocean temperatures and climate change. Key methods include stress conditioning, which exposes organisms to sublethal stress to induce physiological changes; assisted gene flow, which increases the presence of desired naturally occurring genes; and hybridization, which combines genetic material from different species to increase diversity and adaptability. While assisted evolution is seen as a temporary solution for threatened species, its long-term implications remain a subject of ongoing research and debate.
Did You Know?
- Assisted evolution has been practiced for thousands of years, including selective breeding of Asian wolves over 30,000 years ago.
- Gregor Mendel used assisted evolution for non-commercial purposes, leading to the discovery of genes and alleles.
- Assisted evolution is being used to interbreed different colonies of the Great Barrier Reef to test for increased resistance to warmer living conditions.
- Stress conditioning via heat shock on rat kidneys in a 1989 experiment extended their safe cold storage time to 48 hours.
Frequently Asked Questions
What is Assisted evolution in the Nova series?
It is the deliberate use of human intervention to nudge natural evolutionary processes along at a faster pace than they would proceed on their own. The core goal is to help species adjust to changing environments more quickly than natural selection alone could manage.
What are the main practical uses of Assisted evolution?
On the commercial side, it underpins selective breeding, plant breeding, and broader food-production improvements. On the noncommercial side, it is increasingly applied to species conservation, with coral reef preservation being a highlighted example.
How does Assisted evolution differ from pure natural selection?
Natural selection operates without any external direction, while Assisted evolution introduces purposeful human choices to speed up adaptation. In both cases the underlying mechanism is still evolutionary change; the difference is that a human hand is steering the pace and direction.
Why has Assisted evolution become a bigger public topic recently?
Although people have practiced forms of it for thousands of years—mostly for commercial and business purposes—it has recently drawn wider public attention through noncommercial applications. Species conservation, particularly efforts to protect coral reefs, has pushed the concept into mainstream discussion.
Which scientific fields does Assisted evolution touch on?
It sits at the intersection of evolutionary biology, conservation biology, and agriculture. The series treats it as a cross-disciplinary topic because the same underlying principle—accelerating adaptation through human intervention—shows up in all three areas.
More in Nova episodes 1-19
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