
3 4 c m
40cm
actual image size: 32cm x 26cm
Description
Some of the DNA in bones and teeth can last for many years after a person has died. Scientists can examine DNA from people murdered a century ago, or even from 3000-year-old ancient Egyptian mummies by using a PCR. PCR makes millions of exact copies of a piece of DNA in just under an hour or so, thus allowing scientists to extract DNA from tiny samples that would be too small for other methods.
Image Details
Image Ref.
10322159
© Science Museum / Science & Society Picture Library