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