3D-rendered image of the elegans worm used in the study
Individuality has a biological basis

A new study on feeding behaviour of worms indicates that individual variation, even between genetically identical conspecifics, finds its origin in the brain. A possible explanation for individuality is that there is some randomness in how neurons connect during development, and the action of certain neurotransmitters such as dopamine and serotonine. Individuality is important for a population to survive changing demands from the environment, ensuring that at least some individuals will continue to live and reproduce.

Read the full story: Rockefeller University
Scientific publication: Cell