Science for Everyone: DNA

Interest of justice is best served by ascertaining the truth and the Court should be furnished with the best available science and may not be left to bank upon presumptions, unless science has no answer to the facts in issue.”

My Lord, What is DNA?

All living beings are composed of cells, which are the smallest and basic unit of life. An average human body has trillion of cells of different sizes. DNA (Deoxyribonucleic Acid), which is found in the chromosomes of the cells of living beings, is the blueprint of an individual. Human cells contain 46 chromosomes and those 46 chromosomes contain a total of six billion base pair in 46 duplex threads of DNA. DNA consists of four nitrogenous bases-adenine, thymine, cytosine, guanine and phosphoric acid arranged in a regular structure. When two unrelated people possessing the same DNA pattern have been compared, the chances of complete similarity are 1 in 30 billion to 300 billion.”

Hon’ble Justice C.K. Prasad, Nandlal v. Lata, (2014) 2 SCC 576.