Question

Can two people have the same DNA?

Answer 1

DNA is a molecule made up of two polynucleotide chains that coil around each other to create a double helix and carry genetic instructions for the development, functioning, growth, and reproduction of all known organisms and viruses. Nucleic acids are made up of DNA and ribonucleic acid (RNA). Nucleic acids are one of the four major types of macromolecules that are required for all known forms of life, along with proteins, lipids, and complex carbohydrates.

Complete answer:
Deoxyribonucleic acid, or DNA, is an organic molecule with a complex molecular structure found in all prokaryotic and eukaryotic cells, as well as many viruses. For the transfer of inherited traits, DNA codes genetic information.
Chromosomes, which are grouped into $23$ pairs, organize DNA. When a sperm cell is made, the father’s genome is split in half, and each sperm contains one chromosome from each of the $23$ pairs, and the same is true for the mother’s egg cells. When an egg and sperm unite to produce an embryo, the resulting genome contains half of the mother’s and half of the father’s chromosomes, which are chosen at random.
Same-sex siblings may theoretically be formed with the same chromosome selection, but the chances of this happening are one in $246$ or nearly $70$ trillion to one. It’s actually a lot less likely than that. Individual genes are frequently swapped from one chromosome to another in the pair before the chromosomal pairs entirely split. This means that even if successive sperm were produced with the exact same chromosome selection, the genes would not be identical.
Because many of the genome’s gene pairs are identical, it doesn’t matter which copy is utilized, but the chances of generating an exact duplicate genome by chance are still extremely slim. Even identical twins do not always share the same DNA. Point mutations in random genes can be caused by cosmic rays and compounds in our diet, such as caffeine and nicotine.

Note:
Because of mutations or "mistakes" in the DNA sequence that occur occasionally, every human genome is unique. When a cell divides in two, it makes a copy of its genome and divides it into two new cells, one copy for each. The entire genome sequence is theoretically replicated correctly, but in practice, an incorrect base is occasionally inserted into the DNA sequence, or a base or two is left out or added.