DNA is accountable for the transferal of features and appearances for the transferal of features and appearances that we inherit from our parents. Every person is made from cells containing DNA in the cell nuclei. DNA is 23 pairs of chromosomes, each of these contains genetic sequences. You inherit half of your chromosomes from our mother and the other half from our father. Identical twins are the only people who have the same DNA, other than twins no two people have the same DNA.Polydactyly, muscular dystrophy, and Huntington’s disease are some dominant disorders. A recessive disorder can be cystic fibrosis, and colorblindness.X-linked means that the gene causing the trait or disorder is located on the X chromosome. Red-green color blindness, and hemophilia are some X-linked disorders. Y-linked means that the genecausing the trait or disorder is located on the Y chromosome. Infertility in men and women, and azoospermia.