Question

Does everyone have unique DNA?

Answer 1

A molecule which comprises two chains of polynucleotide which are coiled around each other to form a helix like structure is known as deoxyribo nucleic acid (DNA). These molecules comprise all the genetic information for the development, growth, reproduction and functioning of all the organisms.

Complete answer:
Deoxyribo nucleic acid (DNA) is a molecular structure which is made up of two polynucleotide chains coiled around each other to form a helix-like structure. These molecular structures contain all the important genetic information of growth, development, reproduction and functioning of all organisms. They are the nucleic acids in nature.

Monomers of this DNA are called nucleotides. Nucleotide contains four different nitrogen-containing bases (adenine, guanine, thymine and cytosine), a phosphate group and a sugar called deoxyribose. With the help of covalent bonds each nucleotide of one pair is linked to the sugar base of another nucleotide. On the basis of nitrogenous bases they are divided into purines and pyrimidines.

Human DNA is 99.9 percent identical in nature. But that 0.1 percent represents millions of different locations in the human genome from where the variation occurs. There are multiple ways for our body to have a unique set of DNA. The sequence of DNA is unique because of the recombination. During the formation of gametes, a recombination process occurs where part of DNA is exchanged between the chromosomes.

Hence, everyone has a unique DNA because of the process of recombination.

Note:
DNA is a genetic material in almost all the organisms on earth. It is a polymer of nucleotides.
It is found in the nucleus of the cells.