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 task worksheets that have been designed to cover the part of point 7.1 of the AQA A-level Biology specification which states that students should be able to use the test to compare the goodness of fit between the observed phenotypic ratios and expected ratios.
The lesson has been written to include a step-by-step guide that 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 7.1 (inheritance) and links are made throughout the lesson to earlier parts of this topic such as dihybrid inheritance as well as to earlier topics such as meiosis.
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AQA A-level Biology Topic 7: Genetics, populations, evolution and ecosystems
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Topic 7.1: Inheritance (AQA A-level Biology)
This bundle contains 7 lessons which combine to cover the content of topic 7.1 (Inheritance) of the AQA A-level Biology specification. All 7 are fully-resourced and contain differentiated tasks which allow students of differing abilities to access the work whilst being challenged. They have been designed to include a wide range of activities that check the understanding of the current topic as well as making links between other parts of this topics and topics covered earlier in the course. The lessons on codominant and multiple alleles and epistasis are free so you can sample the quality of this bundle before deciding to make a purchase
£10.00
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Maths in A-level Biology (AQA A-level Biology)
"Overall, at least 10% of the marks in assessments for biology will require the use of mathematical skills" This sentence is taken directly from the AQA A-level Biology specification and clearly shows that being able to apply these skills in the context of biology will have a significant impact on a student's chances of success. This bundle has been created to cover as much of those mathematical skills as possible and the following specification points are covered by these 6 lessons: * Represent phenotypic ratios (monohybird and dihybrid crosses) * Use and manipulate the magnification formula * Use the chi-squared test to test the significance of the difference between observed and expected results * Use the Hardy-Weinberg principle to calculate changes in allele frequency * Calculate an index of diversity for a habitat A revision lesson is also included in this bundle which acts as a fun and engaging revision of the range of calculations
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Such a fantastic lesson, sequenced really well.
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