We inherit genes from each parent but the result is unique. Inheritance of some characteristics is simple, e.g. eye colour. Others interact to give a result that it a mixture, e.g. hair colour.

• The genes that you inherit make up your genotype
• The resulting product is your phenotype

Genotyping determines the genes you inherited but not the result. Predictable phenotypes include those associated with disease, e.g. cystic fibrosis but rarely diet- or age-related diseases such as cancer, cardiovascular disease and diabetes.