what is a gene? what is so special about the DNA of a red blood cell? and how is its' specialty adapted to it's function?

a gene is a sequence of paired nucleotides that determine a specific trait that will be prevealent in a specific organism. the interesting thing about red blood cells is that once they leave the bone marrow the nucleus of the cell collapses into the cell and it becomes prokaryotic; this allow s the cell to carry oxygen to the body without the nuclues using most of it and its concave shape allows more oxygen to be transported.