In 1951, Rosalind Franklin began one of the key scientific investigations of the century. The young British scientist produced an X-ray photograph that helped show the structure of DNA, the molecule that holds the genetic code that underpins all life.

The discovery was integral to the transformation of modern medicine and has been described as one of the greatest scientific achievements ever.

Farhana Haider spoke to Rosalind's younger sister, Jenifer Glynn, in 2017.

(Photo: Dr Rosalind Franklin. Credit: Donaldson Collection/Michael Ochs Archives via Getty Images)