1, the dragon begets the dragon, the phoenix begets the phoenix, and the mouse's son can make holes.

2. Tiger father has no children.

3, a mother gave birth to nine children, even ten mothers.

4. No pains, no gains.

5. My father is short, and so is my mother.

Proverbs about variation:

1, Longsheng Jiuzi, all different.

2. golden phoenix flew out of the henhouse.

3. Shining on you is better than blue.

4, orange raw Huainan is orange, raw Huaibei is orange.

The fruit of the tree is bitter and sweet, and the mother's son is stupid and wise.

: heredity:

There are similarities in traits between parents and offspring, which indicates that traits can be passed from parents to offspring. This phenomenon is called heredity. Genetics is the study of this phenomenon. At present, it is known that the existing life on the earth is mainly based on DNA. In addition to heredity, the factors that determine biological characteristics are also the environment and the interaction between environment and heredity. Heredity originated from the informationization or rhythm of early life process.

Heredity is the phenomenon that offspring repeat the characteristics (traits) of parents in this continuous system, and its essence is the genetic material-gene brought to offspring by gametes produced by parents. The same genes stipulate the same traits of biological development, so they are hereditary, which reflects the stability of the biological world. Different expression types of the same trait are called relative traits, which can be stably passed on to future generations.

Change:

Variation is a natural phenomenon of biological reproduction and the result of heredity. The phenomenon that there are differences in traits between parents and children is called variation. It can be divided into heritable variation and heritable variation.

The stability of genes is relative, because it is inevitable that the structure of genes will change at this time or at that time in the long-term development of generations. The gene whose structure has changed makes the development of the organism different from that before the change, so there is variation (heritable variation).

Genetic variation gives new content to heredity, and also enables the long-lived continuous system of organisms to develop and evolve continuously. Without inheritance, it is impossible to maintain the relative stability of traits and species; Without variation, there will be no new traits, and there will be no species evolution and new variety breeding.