This lesson guides students through the use of the chi-squared test to determine the significance of the difference between observed and expected results. It is fully-resourced with a detailed PowerPoint and differentiated worksheets that have been designed to cover point 8.2 (vi) of the Edexcel A-level Biology B specification
The lesson includes a step-by-step guide to demonstrates how to carry out the test in small sections. At each step, time is taken to explain any parts which could cause confusion and helpful hints are provided to increase the likelihood of success in exam questions on this topic. Students will understand how to use the phenotypic ratio to calculate the expected numbers and then how to find the critical value in order to compare it against the chi-squared value. A worked example is used to show the working which will be required to access the marks and then the main task challenges the students to apply their knowledge to a series of questions of increasing difficulty.
This is the final lesson of topic 8.2 (transfer of genetic information) and links are made throughout the lesson to earlier parts of this topic such as dihybrid inheritance as well as to earlier topics like meiosis
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Topic 8: Origins of genetic variation (Edexcel A-level Biology B)
This lesson bundle contains 10 lessons which are fully-resourced and have been designed to cover the content as detailed in topic 8 of the Edexcel A-level Biology B specification (Origins of genetic variation). Each lesson includes a wide range of activities that will engage and motivate the students whilst covering the following topic 8 specification points: * Mutations are the source of new variations * Random assortment and crossing over in meiosis give rise to new combinations of alleles in gametes * Random fertilisation brings about genetic variation * The meaning of genetic terms * Be able to construct genetic crosses and pedigree diagrams * The inheritance of two non-interacting unlinked genes * Autosomal linkage as the presence of alleles on the same chromosome * Sex linkage on the X chromosome * Use the chi squared test to determine the significance of the difference between observed and expected results * Stabilising and disruptive selection * Genetic drift * Population bottlenecks and the founder effect * Monitoring changes in allele frequencies using the Hardy Weinberg equation If you would like to sample the quality of the lessons in this bundle then download the sex linkage and genetic drift lessons as these have been uploaded for free
£15.00
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Topic 8.2: Transfer of genetic information (Edexcel A-level Biology B)
Each of the 6 specification points in topic 8.2 of the Edexcel A-level Biology B specification are covered by the 6 lessons included in this bundle: (i) Understanding of the key genetic terms (ii) Be able to construct genetic crosses and pedigree diagrams (iii) Understand the inheritance of two non-interacting unlinked genes (iv) Understand that autosomal linkage results from the presence of alleles on the same chromosome (v) Understand sex linkage on the X chromosome (vi) Be able to use the chi squared test The lessons contain step by step guides that walk students through the key details of this topic, such as the construction of genetic crosses or the calculation of the chi squared value. There are also lots of exam-style questions to challenge the students to apply their understanding and the mark schemes that are embedded in the PowerPoints will allow them to assess their progress. The sex linkage lesson has been uploaded for free if you would like to sample the quality of lessons in this bundle.
£9.50
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