# Biodiversity, Classification, Conservation and Genetic Technology

> CIE A-Level Biology · CIE 9700
> Source: https://www.owlsprep.com/study/cie-9700-u19-overview/
> Weight: n/a

This unit connects ecological concepts of biodiversity with modern classification, conservation practice, and cutting-edge genetic technology, exploring human impacts on life and approaches to protection and innovation.

**Prerequisites:** Basic genetics and inheritance (Unit 16); Foundational ecosystem ecology (Unit 18)

## Learning objectives

- Define and distinguish between different levels of biodiversity and calculate common biodiversity metrics
- Explain modern classification systems and the purpose of taxonomic organization of life
- Evaluate different conservation strategies for protecting endangered species and ecosystems
- Describe core techniques of genetic technology and evaluate their applications in medicine, agriculture and conservation

## Unit at a Glance

This unit follows a logical arc from measuring the variety of life on Earth, to how we organize and name that diversity, to how we protect threatened species and ecosystems, and finally to how modern genetic technology lets us manipulate DNA for a wide range of human benefits.

Each sub-topic builds on the previous one: understanding biodiversity sets the context for why classification matters, why conservation is a critical global priority, and how genetic technology can advance both conservation goals and biotechnological progress.

This unit is split into 7 core sub-topics:
- [Biodiversity and measurement](https://www.owlsprep.com/study/cie-9700-u19-biodiversity-and-measurement/) — Introduces levels of biodiversity and methods to calculate species richness and diversity.
- [Classification](https://www.owlsprep.com/study/cie-9700-u19-classification/) — Covers traditional and modern classification systems, including the three-domain model.
- [Conservation of endangered species](https://www.owlsprep.com/study/cie-9700-u19-conservation-of-endangered-species/) — Explores threats to biodiversity and compares in-situ and ex-situ conservation strategies.
- [Principles of gene technology](https://www.owlsprep.com/study/cie-9700-u19-principles-of-gene-technology/) — Outlines core techniques including PCR, gel electrophoresis, restriction enzymes and gene cloning.
- [Genetic modification](https://www.owlsprep.com/study/cie-9700-u19-genetic-modification/) — Explains the process of creating genetically modified organisms and common examples.
- [Gene editing](https://www.owlsprep.com/study/cie-9700-u19-gene-editing/) — Introduces modern targeted gene editing techniques including CRISPR-Cas9.
- [Biotechnology applications](https://www.owlsprep.com/study/cie-9700-u19-biotechnology-applications/) — Covers real-world uses of genetic technology in medicine, agriculture and conservation.

## Common pitfalls

- **Wrong:** Confusing species richness with species evenness when describing biodiversity
  - Why it fails: Richness only counts the number of different species, while evenness accounts for relative population abundance
  - Correct: Always clarify which measure of biodiversity you are referring to in exam responses
- **Wrong:** Mixing up in-situ and ex-situ conservation strategies
  - Why it fails: The prefixes indicate where conservation takes place, not the type of species being protected
  - Correct: Remember: in-situ = in the natural habitat, ex-situ = outside the natural habitat
- **Wrong:** Confusing genetic modification with gene editing
  - Why it fails: The two processes have different end results and methods
  - Correct: GM inserts foreign DNA from another species, while gene editing modifies the organism's existing DNA

## Cheatsheet

| Concept | Key Summary |
| --- | --- |
| Simpson's Index of Diversity ($D$) | $D = 1 - \sum (n/N)^2$, higher $D$ = more diverse ecosystem |
| Binomial Nomenclature | Two-name naming system: Genus species (Genus capitalized, italicized) |
| In-situ Conservation | Conservation of species in their natural habitat (e.g. national parks) |
| Ex-situ Conservation | Conservation of species outside natural habitat (e.g. seed banks, zoos) |
| Polymerase Chain Reaction (PCR) | In vitro technique to amplify (make many copies of) a target DNA sequence |
| Genetically Modified Organism (GMO) | Organism whose genome contains one or more foreign genes from another species |
| CRISPR-Cas9 | Targeted gene editing system that cuts and modifies DNA at specific pre-selected sequences |

## What's next

Begin your study of this unit with the first sub-topic on biodiversity measurement, which lays the foundation for all subsequent topics on classification, conservation, and genetic technology. After completing all sub-topics in this unit, you will move on to the next unit of the CIE A-Level 9700 syllabus covering selection and evolution.

- [Biodiversity and measurement (First sub-topic of this unit)](https://www.owlsprep.com/study/cie-9700-u19-biodiversity-and-measurement/)
- [Classification](https://www.owlsprep.com/study/cie-9700-u19-classification/)
- [Conservation of endangered species](https://www.owlsprep.com/study/cie-9700-u19-conservation-of-endangered-species/)

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