The most basic unit of human life is the cell. Countless cells (about100000000000000000) make up various tissues and organ systems in the human body, and maintain the normal physiological functions of the human body. At the beginning of every little life, a cell divides and grows into a fetus.

Where are the genetic genes? But in the nucleus of a cell, there is a dark substance called chromosome, which stores the coding information of biological inheritance. Humans have 23 pairs (46 chromosomes), and all the genetic genes are carried on the chromosomes. Gene is the basic unit of heredity. Genes have the following characteristics:

The stability of (1) gene can "faithfully" replicate itself. Without this stability, the biological race cannot continue.

(2) It can control the metabolism of cells, which is also necessary for maintaining life.

(3) Genes can also undergo "mutation", which enables life to evolve and develop.

Therefore, heredity is regular, and human beings can make use of it to foster strengths and avoid weaknesses, which is not conducive to human survival and to control heredity as much as possible, so that the descendants of the Chinese nation will become more and more outstanding, and shine on you will be better than Blue. The genetic quality of human beings improves people's quality and is the source of the development of the Chinese nation.