Genetic diversity refers to the total number of genetic characteristics that make up a species' genetic composition. It varies greatly depending on the number of species available as well as across species, and it can be linked to a species' longevity. It differs from genetic variability, which is the propensity for hereditary traits to change. Different species can adapt to their changing habitats due to genetic diversity. Eye color, blood type, camouflage in animals, and leaf modification in plants are a few examples of genetic diversity. This article will explain to you about Genetic Diversity which will be helpful in preparing the Environment Syllabus for the UPSC Civil Service exam.

How is Genetic Diversity Created?

• Mutations are alterations that occur in an individual's DNA.
• Mutations can occur when errors are created while cells are copying DNA, similar to when a word is copied and the spelling is incorrect.
• The genetic diversity of a species is made up of these mutations. More and more errors are made throughout several generations, which increases the number of mutations.
• However, occasionally these mutations might result in changes that are advantageous for a species.
• The majority of mutations are either harmful or have no effect at all.
• These advantageous mutations may increase a person's likelihood of surviving and increase the number of offspring they can have.
• This is adaptation—the process through which a species alters in order to flourish in its surroundings.

Genetic Diversity - Viral implications

• When developing vaccines, the high genetic diversity of viruses must be taken into account.
• High genetic variety makes it harder to create vaccines that are specifically targeted and enable viruses to quickly evolve to become resistant to the fatal effects of vaccination.
• For instance, a high degree of genetic diversity in the protein antigens affects the effectiveness of malaria immunizations.
• In addition, the application of current viral load and resistance tests is restricted by the genetic diversity of HIV-1.

What Happens When There is Low Genetic Diversity?

• Genetic diversity is said to be minimal when there are not many mutations discovered in a species' DNA.
• There aren't many variations among individuals in a species with low genetic diversity since there aren't many different gene alleles present.
• This would imply that there are fewer chances to adjust to environmental changes.
• Due to habitat degradation, low genetic diversity is frequently observed. For instance, populations shrink when a species' habitat is destroyed or torn apart into small parts.
• Because fewer individuals may survive in the remaining habitat, there are fewer individuals breeding to pass on their alleles, which can result in small, fragmented populations losing genetic diversity.
• The variety of partners is likewise constrained in small populations. Individuals will eventually all be related to one another and be compelled to mate with close relatives.
• The genetic diversity of a species can become so low that it will eventually become extinct.
• New alleles can be introduced in these situations to save the population.
• Introducing new individuals into a group in order to boost genetic variety and enhance population health is referred to as a genetic rescue conservation strategy.

Genetic Diversity - Global Initiatives

• There are actions being taken to protect these vital natural resources and genetic diversity at the international, national, and local levels.
• In order for the post-2020 global biodiversity framework to be established at the UN Biodiversity Conference (COP 15) in October 2021, Parties to the Convention on Biological Diversity (CBD) are creating goals, targets, and indicators for genetic diversity.
• The Sustainable Development Goals and the International Treaty on Plant Genetic Resources for Food and Agriculture are two other international agreements that address genetic diversity.
• The preservation of biological knowledge for the future is made possible by gene banks that save millions of seeds from throughout the world, botanical gardens that display stunning plant collections, and pastoralists who preserve old cattle breeds.
• Genetic diversity may make the difference between many species' survival and extinction, including, eventually, our own, in light of the changing climate, disease epidemics, and other environmental hazards we face.

Conservation of Genetic Diversity

In situ conservation

• Because it is impossible to conserve all of biodiversity, specific "hotspots" are identified and protected to protect species that are endemic to a specific habitat and are threatened, endangered, or on the verge of extinction.
• For example, wildlife sanctuaries and national parks.

Ex-situ conservation

• It refers to the removal of threatened plants and animals from their natural habitat and placement in a special setting to provide them with special care and protection. Botanical gardens, zoos, wildlife safaris, and so on.
• Cryopreservation techniques are used to keep gametes of threatened species alive and fertile for a longer period of time.
• In-vitro fertilization of eggs and tissue culture propagation of plants are both possible.
• A genomic library is a recent advancement in the preservation of genetic diversity.

Genetic Diversity - Importance

• Genetic diversity results in a person's ability to adapt to stress, illnesses, and unfavorable environmental situations as well as varied physical characteristics.
• Natural environmental changes or those brought on by human activity trigger the survival of the fittest and natural selection.
• As a result of genetic diversity, the sensitive kinds perish while the ones that can adapt to changes thrive.
• By preserving distinct variations of genes that may be resistant to pathogens, illnesses, or other situations, genetic variety is essential for a healthy population.
• Cross-breeding various genetic variants can result in new plant varieties that have desirable features like greater stress tolerance and disease resistance.
• Unwanted hereditary features are less likely to repeat when there is genetic diversity.
• Genetic diversity guarantees that a species will continue to exist in some form.

Genetic Diversity - Threats

• Although it is widely known that many species are disappearing from the planet, genetic diversity within species is also declining.
• Wild creatures now have less habitat and resources due to the growing human population and increased exploitation of natural resources.
• Numerous communities of wild animals and plants have shrunk or become more secluded throughout time.
• Numerous species have also experienced regional extinctions. Genetic diversity has decreased globally as a result of this.
• According to scientists, the genetic diversity of animals may have decreased globally during the Industrial Revolution by as much as 6%. Because of this, many species have a harder time adapting to new problems like pollution, climate change, and emerging diseases.
• More species may become unhealthy and require conservation measures if too much genetic diversity is lost.
• We can, however, take action to preserve and restore genetic variety among many species.

Conclusion

Genetic diversity must be preserved and protected. This can be accomplished by conserving our remaining wild populations. Nature reserves and wildlife bridges can be used to reconnect wild populations that have become separated by our cities and highways. We can also restore habitats, which will allow wild populations to grow. We can even remove harmful stressors and pests to allow populations to naturally regenerate. We can also reintroduce species that have been removed from their natural habitats. These strategies, when combined, have the potential to help halt the loss of genetic diversity. It is critical to safeguard genetic diversity because it serves as the foundation for healthy species.

FAQs

Question: What is genetic diversity?

Question: Why is genetic diversity important for species survival?

Question: What factors contribute to the loss of genetic diversity?

Question: How can we protect genetic diversity?

Question: How does genetic diversity affect the resilience of ecosystems?

MCQs

1. What does genetic diversity refer to?

A) Differences in the climate of regions

B) Variations in the physical traits of species

C) Variations in the genes within a species

D) Differences in the behavior of different species

2. Why is genetic diversity crucial for species survival?

A) It ensures that species cannot adapt to new environments.

B) It allows species to adapt to environmental changes and enhances survival chances.

C) It makes species more vulnerable to diseases.

D) It decreases reproductive success in species.

3. Which of the following is a major threat to genetic diversity?

A) Sustainable farming practices

B) Habitat destruction and overexploitation

C) Increase in biodiversity

D) Conservation of species

4. How does a loss of genetic diversity affect ecosystems?

A) It improves the adaptability of species to environmental changes.

B) It increases the resilience of ecosystems.

C) It makes ecosystems more stable and diverse.

D) It reduces the ability of species to adapt to new environmental conditions.

5. Which of the following is an effective way to preserve genetic diversity?

A) Overhunting and deforestation

B) Habitat conservation and sustainable practices

C) Ignoring climate change impacts

D) Introducing genetically modified species into ecosystems

GS Mains Questions and Model Answers

Q1: Explain the importance of genetic diversity in the context of environmental conservation.

Answer: Genetic diversity is a cornerstone of environmental conservation because it enhances the adaptability and resilience of species. A genetically diverse population can better withstand environmental changes, such as climate change, disease outbreaks, and habitat loss. This diversity ensures that species can evolve and adapt to new conditions, increasing their chances of survival. In ecosystems, genetic diversity supports a variety of traits, from disease resistance to reproductive success, which maintains ecological balance. Without genetic diversity, populations become vulnerable to inbreeding, diseases, and environmental shifts, leading to a higher risk of extinction. Conserving genetic diversity is, therefore, essential for the long-term health of ecosystems, agriculture, and human welfare. Efforts to preserve genetic diversity include protecting habitats, reducing overexploitation, and promoting sustainable farming and conservation practices. In summary, genetic diversity is crucial for the stability and resilience of both natural ecosystems and the species within them.

Q2: What are the factors that contribute to the loss of genetic diversity in species, and how can this loss be prevented?

Answer: The loss of genetic diversity is primarily driven by factors such as habitat destruction, overexploitation, climate change, pollution, and inbreeding. Habitat destruction reduces the space in which species can live and reproduce, leading to smaller, isolated populations with limited genetic variation. Overexploitation, such as hunting or overfishing, can deplete populations, resulting in a loss of genetic diversity. Climate change affects species' ability to adapt to new environmental conditions, reducing their genetic pool. Pollution can introduce harmful substances that affect species' reproductive success and overall health, further diminishing genetic diversity. Inbreeding, occurring when small populations have limited genetic variation, can also reduce the fitness of individuals. To prevent the loss of genetic diversity, habitat conservation, reducing human impact, sustainable resource management, and genetic monitoring of populations are essential. Captive breeding programs and gene banks can also help conserve genetic diversity, ensuring the survival of endangered species.

Q3: Discuss the role of genetic diversity in maintaining the stability of ecosystems.

Answer: Genetic diversity plays a critical role in maintaining the stability and resilience of ecosystems. It enables species to adapt to environmental changes, such as shifts in temperature, precipitation, or the emergence of new diseases. Higher genetic diversity within a species leads to a greater variety of traits, such as disease resistance, reproductive success, and behavioral flexibility, which allows species to survive in changing environments. In ecosystems, genetic diversity supports biodiversity by ensuring that different species can coexist and fulfill various ecological roles. A genetically diverse population can recover more quickly from environmental stresses, ensuring that ecosystems remain functional and balanced. For example, in plant populations, genetic diversity allows for resistance to pests, diseases, and varying climatic conditions, supporting ecosystem health. Conversely, low genetic diversity can result in the vulnerability of species, leading to population declines and disruptions in ecosystem services. Thus, genetic diversity is essential for the long-term stability and sustainability of ecosystems.

Previous Year Questions on  Genetic diversity

1. UPSC CSE 2020

Question: How does genetic diversity contribute to the survival and adaptability of species?

Answer: Genetic diversity increases the ability of species to adapt to changing environments by providing a variety of genetic traits that enhance survival and reproduction. It allows populations to evolve over time, increasing resilience to diseases, climate change, and environmental pressures.

2. UPSC CSE 2019

Question: Discuss the importance of maintaining genetic diversity in the context of conservation biology.

Answer: Maintaining genetic diversity is crucial in conservation biology as it ensures the long-term survival and adaptability of species. It reduces the risk of extinction, improves the resilience of populations to environmental changes, and supports the overall stability and functioning of ecosystems.