DNA is the genetic code which makes up genes, which are responsible for giving an organism a specific characteristic.

Causes of variation

Some variation is passed on via genes and some variation is the result of differences in the surroundings, or what an individual does.

Types of variation

Collecting data on the differences between members of a species can give two different types of results: continuous and discontinuous.


Characteristics like eye colour and genetic diseases are inherited.

Adaptations and evolution

Evolution explains how better adapted organisms have an advantage.

Natural selection leads to evolution

Evolution is the process by which small changes in organisms occur over long periods of time and new species are formed.

Species and selective breeding

Selective breeding is when organisms are deliberately bred so their offspring have the desirable characteristics.

Genetic conditions

Genetic conditions are passed from parents to their children. Learn about conditions that are inherited, such as sickle cell disorder and cystic fibrosis.

Darwin v Doudna: Who was the greatest scientist?

Compare the work of two great scientists, Darwin and Doudna.

Should extinct species be brought back to life?

Discussing whether extinct species should ever be brought back to like. Can you think like a scientist?

10 Classroom videos

We have a selection of great videos for use in the classroom