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Note: This factsheet has been designed as a post-session handout for learners taking part in a Genomics Game session, but can also be used as learning resources in other settings. See the full collection here.

Key facts

  • Our genomes are 99.9% the same as the genomes of other individuals.
  • It is the 0.1% difference that interests us in healthcare.
  • The difference or variation in our genomes is what makes each of us unique.
  • Most variation causes no harm, but some have serious consequences and can impact on health.

Did you know?

  • As well as sharing around 99.9% of the genome with each other, we also share 96% with chimpanzees, 90% with mice and 60% with bananas.
  • Although it seems small, the 0.1% variation in the 3 billion letters of our genome equates to around 3 million differences.
  • Individuals may have the same genetic changes linked to a condition, but this does not mean they will present with similar or even any symptoms.

Find out more

For more fun facts about the genome, visit our Flickr channel.


Publication type

Education and training resources

Genomics Game

First published

27th June 2019

Page updated

18th November 2019

Document Download

Game factsheet 3: No such thing as the perfect genome