Mouse's understanding of solar terms

(1) Rats are herbivores, and their teeth are divided into incisors and molars, which are similar to reptiles, thus proving that mammals evolved from reptiles.

(2) The similarity between parents and children is called heredity, which is realized through reproduction and development. In the genetic process, parents transmit genes to their offspring through reproductive process, while in sexual reproduction, sperm and egg cells are the "bridges" between parents and children. Therefore, in the process of breeding rodents, parents transmit genes to their offspring through germ cells.

(3) The morphological structure, physiological characteristics and behaviors of organisms are called traits, and the traits of organisms are determined by genes, which are DNA fragments with genetic effects. That is to say, not all deoxynucleotide sequences carry genetic information on DNA molecules, and some fragments do or do not, and the fragments that can carry genetic information are genes. Generally speaking, there are many genes on a DNA molecule, one of which controls a character. Some genes control the same trait, and genes control the trait by controlling the synthesis of protein. Some of these protein are structural proteins and some are various enzymes, which affect the composition or metabolism of biological characters.

(4) Accidentally bitten by a mouse, blood gushed out like a fountain, indicating that the artery was bitten by a mouse. At this time, press the proximal end and call 120 for help.

(5) Some biological traits are controlled by a pair of genes, which are often divided into dominant and recessive. Dominant genes control dominant traits and recessive genes control recessive traits. When one of the genes controlling a trait is dominant and the other is recessive, only the traits controlled by the dominant gene are displayed. Dominant genes are represented by capital letters, and recessive genes are represented by lowercase letters. The coat color of mice is black and white, and black is dominant (with A).

① Male mice with recessive traits and white body color can be selected to cross with this black female mouse, which can be identified according to the coat color of the offspring mice;

(2) If all generations of mice born have no white hair but all black hair, it can be concluded that the genome of the identified black mouse has become AA. The chart is as follows:

③ If there are black-haired mice and white-haired mice in the offspring, it can be concluded that the identified genome of black mice becomes Aa, and the probability of white mice is 50%. The picture is as follows: that is, the offspring of black mice and white mice are half.

So the answer is: (1) crawling;

(2) germ cells;

(3) Traits are controlled by genes;

(4) proximal end;

(5) white? AA？ Aa 50%