Why are genes important?

Also called blueprint of life, genes contain vast amounts of biological information. Our genome consists of three billion nucleobase pairs, made up of combinations of four nucleobases A, C, G and T. This is equal to summing up all newspaper letters for 24 years. Although genetic difference among people is about 0.1%, this is significant enough to affect not only physical characteristics such as skin color, height, and weight, but also personality and disease susceptibility.