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What Is D N.A? it's benefits. Why the habits transferred from parents to the children? Why the children look like their parents? These are some reasons which leads the scientists to invent Deoxyribose Nucleic Acid popularly known as DNA. These genetic informations are due to the nucleotide. The adenine,guanine,thymine and cytosine are the four varieties that form the base which is found in a DNA . Nitrogenous base is one of the three parts that form nucleotide, the other parts are sugar molecule and the phosphate molecule. Thus these two molecules and the nitrogenous base collectively form a unit called a nucleotide. The smaller units of nucleotides forms a larger molecule called DNA. The two twisted hair like fibers forms the DNA. The human body is made of different cells such as muscle cells, skin cells, sperm cells, brain cells etc . Each cell is made of 23 pairs of chromosomes. The chromosomes are made of DNA an proteins. The look and the job of the cell is determined by the proteins. These proteins plays active role in the formation and the growth of a human body. DNA controls the color of the eyes, hair skin, the behavior of a person. It is due to the sexual chromosomes the behavior,looks and the built of the parents being transferred to their children. There are coding and non coding DNA. The coding DNA have the quality that encode some important information of a cell and the non coding DNA is that which do not have any information about the cell. The coding and the non coding DNAs varies from individual to individual due to which a person is different from the other. It is due to this differentiation several things can be established of a human being, not only human being but of each living things. The red blood cells do not have the DNA these are found in the white blood cells. DNA test is performed in the clinical laboratory by taking the blood sample. Several confirmations can be made by this test such as passing on the genetic disorders to the children by the parents, to confirm the father of a particular child, to confirm the ancestral relationship between the two indivduals,to confirm the embryo is free from any genetic disorder etc. Ion crime investigation such as murder, rape etc the DNA test is very helpful to arrest the culprit. The DNA test is also performed to improve the breed of the animals and the plants