The role of genes in controlling inherited characteristics is described. The terms dominant and recessive are defined. Eye colour is used as an example and the combination of two recessive genes is used to explain how people can have blue eyes.
Ask student to bring in family photos and discuss in class the inherited features that can be seen. Students could attempt to explain inheritance in terms of genetic information. The idea of dominant and recessive genes can be discussed. Students could be given some sets of parenmts with certain hair and eye colours, and challenged to predict, if they had one/two/four children, what they might look like.
Students could think about why characteristics sometimes skip a generation.