This fully-resourced lesson explores how the presence of particular alleles at one locus can mask the expression of alleles at a second locus in gene interactions. The detailed and engaging PowerPoint and associated resources have been designed to cover the part of point 16.2 (b) of the CIE International A-level Biology specification which states that students should be able to use genetic diagrams to solve problems that involve gene interactions.
This is a topic which students tend to find difficult, and therefore the lesson was written to split the topic into small chunks where examples of dominant, recessive and complimentary gene interactions are considered, discussed at length and then explained. Understanding checks, in various forms, are included throughout the lesson so that students can assess their progress and any misconceptions are immediately addressed. There are regular links to related topics such as dihybrid inheritance so that students can meet the challenge of interpreting genotypes and link to the different types of interactions
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Topic 16: Inherited change (CIE A-level Biology)
Meiosis, genetic inheritance and the control of gene expression are some of the harder topics on this A-level Biology course and all three are covered in topic 16 (Inherited change) of the CIE A-level Biology specification. The 10 lessons included in this bundle have been planned at length and contain a wide range of tasks that cover the detailed content whilst checking on understanding and key terms and values are introduced through engaging quiz competitions. The following topic 16 specification points are covered by these lessons: Topic 16.1 * The meaning of a homologous pair of chromosomes * The behaviour of chromosomes in animal and plant cells during meiosis * Genetic variation is caused by crossing over, random assortment and the random fusion of gametes at fertilisation Topic 16.2 * The meaning of key genetic terms * Using genetic diagrams to solve problems involving mohohybrid and dihybrid crosses, including those involving autosomal linkage, sex linkage, codominance, multiple alleles and gene interactions * Use the chi-squared test to test the significance of differences between observed and expected results * Gene mutations occur by substitution, deletion and insertion and may affect the phenotype Topic 16.3 * The genetic control of protein production in a prokaryote as shown by the lac operon * The function of transcription factors in gene expression in eukaryotes * Gibberellins and DELLA protein repressors If you would like to sample the quality of the lessons included in this bundle, then download the autosomal linkage and chi-squared test lessons as these have been uploaded for free
£15.00
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Topic 16.2 [b]: The roles of genes in determining the phenotype (CIE A-level Biology)
Each of the 5 lessons within this bundle are fully-resourced and cover the content of point (b) of topic 16.2 of the CIE A-level Biology specification which states that students should be able to use genetic diagrams to solve problems which involve the following: * monohybrid and dihybrid crosses * autosomal linkage * sex-linkage * codominance * multiple alleles * gene interactions Students are guided through the construction of the genetic diagrams for the inheritance of one or two genes and are shown how to analyse the phenotypic ratios to determine whether linkage has occurred or whether a gene interaction is involved. The wide range of activities which includes exam questions with visual mark schemes, differentiated tasks and quiz competitions will maintain engagement whilst providing the students with opportunities to assess their progress against the current topic
£6.50
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