Genomics is a history book, recording the story of human time travel; it is a handbook, recording the manufacturing blueprint and operation secrets of every cell in the human body in a digital way. Studying the genome can trace the evolutionary process of human beings. We can see the records of ancestors fighting with diseases. We can also detect whether the host of the genome is more prone to cancer, heart disease, stroke, depression and so on. We can even get a glimpse of the life span from the length of DNA telomeres.
DNA is a kind of long-chain polymer. In cells, DNA can be organized into chromosome structure, and the whole set of chromosomes are collectively referred to as genome. Chromosomes replicate before cell division. This process is called DNA replication. DNA fragments with genetic information are called genes. Some of the other DNA sequences play a role directly by their own structure, while others are involved in regulating the expression of genetic information.