Respuesta :
Answer:
Chargaff discovered base pairing rules. Franklin took X-ray photographs that revealed that DNA has a spiral structure. This finding helped Watson and Crick create a model of DNA and discover the double-helix.
Explanation:
DNA or deoxyribonucleic acid is made up of two polynucleotide strings twisted around each other and is a quintessential hereditary character that gets transferred from parents to offspring.
The discoveries that led to the modelling of DNA:
- Miescher was the scientist who separated the nuclein from the cell nucleus.
- Researchers Watson and Francis Crick gave the architectural organisation of the DNA.
- They postulated that the molecule is formed of two strands having nucleotides embedded in them that codes for the genetic characters.
- Rosalind Franklin used a technique called X-ray crystallography, to show that the fragment is a double-helical construction.
- Erwin Chargaff gave the nucleotide base-pairing rule in which he postulated how purine and pyrimidine are bound together by hydrogen bonds.
To learn more about DNA discovery models follow the link:
https://brainly.com/question/2126484
