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Edexcel AS Biology Unit 2 6B102 - Biodiversity $4.02
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Edexcel AS Biology Unit 2 6B102 - Biodiversity

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This is one of the two topics of unit 2 edexcel biology. Although the content is specific to edexcel, there is a lot of overlap between other exam boards. Even if you are not studying in the UK you may still find this document useful. Enjoy!

Last document update: 10 year ago

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  • October 25, 2014
  • October 26, 2014
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  • 2013/2014
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By: reemaal-rabie • 7 year ago

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By: Ibby1996 • 7 year ago

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Unit 2 – Biodiversity
 Drugs from plants
 Species and biodiversity
 Natural selection and Evolution
 Conservation and genetic diversity
 Plant cell structure
 Plant stem structure and function
 Starch, cellulose and fibres

, New Taxonomic grouping

 Three domains have been identified based on
molecular phylogeny  compares the structure of a
particular molecule from different organisms to
discover their degree of evolutionary relatedness

 The more similar the structure of the molecule, the
more closely related the organisms are to each other
 This is because changes in molecule structure
generally occur only slowly as they are caused by
mutations

, New Taxonomic grouping
Three Domains
• Bacteria
• Archaea
• Eukaryota

 The idea of the three domains illustrates the scientific
process and the important role of critical evaluation of new
data by the new scientific community
Kingdom
Phylum Classification
Class
Order Order
Family
Genus
Species

, Discovery of Archaea
All life is split into prokaryotes and eukaryotes


A scientist called Woese suggested a third group which
he called the Archaea. Woese published a paper in a
scientific journal using molecular phylogenic evidence

Other scientists study the evidence carefully  peer
review


Other scientists start to collect evidence

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