University of Bristol
Wellcome Trust
Recommended by:
Society of Biology
PEEP for Physics & Ethics at GCSE

Fractions, Percentages and Expressing Risks

Scientists use fractions and percentages to give numeric backing to their conclusions and informing their audience about the proportional weighting in the results. For instance:

Do dogs share ¾ of human genes? 

Analysis in 2003 in the US by a gene mapping team including Dr Craig Venter showed that for 75% of known human genes - lengths of DNA that provide the building instructions for proteins - there was an equivalent dog gene. A total of 18,473 of the known 24,567 human genes had a canine version. The researchers used Craig’s male poodle as their DNA source.

18,473 =  0.7519  =  about 75% of 1 = about ¾


 How to convert between percentages, decimals and fractions

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