1. What is DNA? What does it have to do with genes?
Genes are fragments of DNA with genetic material. Among them, the genetic material fragments are responsible for controlling people’s appearance and so on, while other fragments are responsible for auxiliary control.
Humans have 46 chromosomes, and 22 of them are exactly the same. Only the last pair can determine the sex. At the same time, we can also know that the sex of a baby depends on the father, not the mother.
2. Human blood type:
We divide the composition of blood type A into IAIAI, B is IBIBi, AB is IAIBi, and O is i. Then we also know that A+B gets AB or O. For example, extract i from A and also extract from B If i comes out, then it is still i together, which is the so-called type O blood. In the same way, we can deduce that if the people in a village are all O type blood and do not marry outsiders, then the child born can only be i + i = i, that is blood type O, it cannot be other blood types.
Why do some diseases spread to various parts of the body through blood circulation, etc. and cause the disease, while some diseases only occur in fixed places?
Because the virus also needs to find an environment suitable for its spread to grow, just as appendicitis cannot grow into the neck. Because it is not suitable for growth in the neck.
AIDS, AIDS is a unique virus, it only destroys the human immune system, so that other viruses can pose a greater threat to humans, even if it is a cold, it can easily take people’s lives. However, if a person with AIDS lives in a virus-free environment, theoretically speaking, he will not have any problems.
Are there any exceptions in the world?
Of course there is. For example, if a person has a certain system that has mutated, and it happens to isolate those viruses such as AIDS or make them only latent without getting sick, then this person can not counsel AIDS:-D Hard .
So, if a person has antibodies to certain viruses, can they be extracted so that others can also produce the same antibodies?
Of course not. After all, the production of cells and antibodies takes a long time. Only extracting other people’s cells cannot effectively resist the virus, and patients seem to be unable to wait so long. Vaccination is also to stimulate the antibodies in the body, and to give the antibodies a weakened virus. Let this virus teach the antibodies first and make them more vigilant. When you really get sick in the future, the antibodies can immediately destroy the virus.