Co-dominance (CIE IGCSE Biology SUPPLEMENT)

This fully-resourced lesson has been designed to cover the specification point about co-dominance (and blood groups) as detailed in the supplement section of topic 17 (inheritance) of the CIE IGCSE Biology specification. As specified in this point, students will learn how this inheritance of the ABO blood group system demonstrates co-dominance (and also multiple alleles). A potentially difficult topic, time has been taken to include guidance sections where students are walked through the interpretation of the different genotypes to find out the phenotypes as well as constructing genetic diagrams and calculating blood groups from pedigree trees. There is a real focus on genetic terminology such as allele, locus, genotype and phenotype so that the understanding is deep and students can use this if they choose to further their studies at A-level.

This lesson has been designed for GCSE-aged students studying the CIE IGCSE Biology course but is also suitable for older students who are learning about codominance and multiple alleles at A-level