pptx, 2.55 MB
pptx, 2.55 MB
docx, 13.13 KB
docx, 13.13 KB
docx, 141.44 KB
docx, 141.44 KB

This lesson introduces the three-domain system and describes some of the biochemical methods used in classification to overcome the problems of morphological convergence. The PowerPoint and accompanying resources have been designed to cover points [c] and [e] in AS unit 2, topic 1 of the WJEC A-level Biology specification

The lesson begins with an introduction of Carl Woese and goes on to describe how he is most famous for his definition of the Archaea as a new domain of life. Students were introduced to domains and the other classification taxa in a previous lesson, so their recall of this knowledge is continually tested and built upon as details are added. Students will discover the key differences between Archaea and Bacteria that led to the splitting of the prokaryotae kingdom and the addition of this higher classification rank. Moving forwards, the rest of the lesson considers other molecules that can be compared between species for classification purposes and the primary structure of cytochrome is described and discussed. At this point in the lesson, the students are also tested on their knowledge of the nature of the genetic code and have to explain how mutations to DNA can also be used for comparative purposes. The use of DNA genetic fingerprinting is briefly introduced and this is described in greater detail in a future lesson about assessing biodiversity at a molecular level

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AS Unit 2 Topic 1: All organisms are related through their evolutionary history (WJEC A-level Biology)

All 5 lessons in this lesson bundle are highly detailed to cover the specification points shown below that are found in AS unit 2, topic 1 of the WJEC A-level Biology specification: * The classification of organisms into groups based on their evolutionary relationships * The need for classification * The three-domain classification system * The characteristic features of the five kingdoms of living organisms * The use of physical features and biochemical methods to assess the relatedness of organisms * The concept of species * The use of the binomial naming system * Biodiversity as the variety of organisms found within a specified geographic region * Biodiversity can be assessed in a habitat using Simpson's index of diversity * Biodiversity can be assessed within a species at a genetic level * Biodiversity can be assessed at a molecular level using DNA fingerprinting * Biodiversity has been generated through natural selection * Anatomical, physiological and behavioural adaptations As well as the A-level Biology content within the slides, current understanding and prior knowledge checks in the form of exam-style questions, differentiated tasks and quiz competitions are included throughout to allow the students to assess their progress If you would like to sample the quality of the lessons included in this bundle, then download the classification, species and the binomial naming system lesson as this has been shared for free

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