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Genetic mutations happen all the time.
For example, some freaks, weird diseases.
can be the result of a genetic mutation.
In general, people with genetic mutations die because they are not adapted to survive.
There are also mutations that produce specific functions, but the inheritance of individuals can be easily eliminated by society.
The probability of a genetic mutation is very small.
Therefore, a person's genetic mutation is generally only a change in one aspect.
It doesn't happen that there are many functions that mutate at the same time and create monsters.
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Yes. However, due to the large number of genes, many people may have had genetic mutations, but they are insignificant and do not affect people's lives, so they are not taken seriously. Maybe it's just increased dandruff, lighter hair color, etc., and some diseases are also caused by genetic mutations.
And because there are so many variables, no one can guarantee what will happen.
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As long as people are multiplied, they will mutate, but the degree of mutation is small, and I don't see it. Every child is not a clone of their parents, that is the result of genetic selection and genetic variation. Some children are born with some deafness, which is a relatively large variant.
It's impossible to have that kind of variation of wings if you want to see it.
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For medical purposes, genetic mutations that are evident in human reproduction are treated as diseases**; As far as society is concerned, the progress of human beings is the progress of material and spiritual civilization, not the "mutation" of biological characteristics. We can't think about what "good" human genetic mutations are, because we can't really assess the consequences of altering basic human biological traits. As for how imperceptible genetic mutations affect the future of humanity, this remains to be seen.
If there is a "what if" is in the case of human genetic mutations, it can only be the destruction of dangerous elements, which must be stopped by human beings.
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Genetic mutations, chromosomal aberrations, and DNA recombination and gene rearrangement can be summed up in one sentence, altered genetic information. Mutation is any heritable change in the genetic material that is not due to genetic recombination, and gene mutation is divided into two categories: spontaneous mutation and induced mutation, and the main reasons for gene mutation are the following three points:
1. It may occur at the chromosome level or at the gene level, the former is called chromosomal aberration, and the latter is called gene mutation. Genetic mutations can be caused by the displacement of base pairs or the increase or decrease of one or more bases.
2. It may be caused by radiation, which causes genetic damage by breaking chromosomes. It can also be produced by the action of chemicals and DNA, or by causing the formation of abnormal strands between DNA. Some types of DNA damage may be caused by radiation, but not chromosomal breaks, which can be corrected by the repair system in the cell.
3. It may also be caused by certain chemicals, which are called chemical mutagens. Many chemical mutagens are known, and the mechanism of mutagenesis is different, and mutations are caused by the substitution of base analogues, chemical modification of bases, and insertion and deletion of bases in the process of DNA replication.
In addition, from the molecular level, gene mutation refers to the change of base pair composition or arrangement order in the structure of genes, based on which there are three factors that cause gene mutation: (1) physical factors: X-rays, lasers, etc. (2) Chemical factors:
Nitrous acid and base analogues, etc. (3) Biological factors: viruses and certain bacteria, etc.
Scientifically speaking, the result of a genetic mutation is a change in the order of bases, that is, a change in genetic information. Genetic mutations, acting on natural selection, accumulate in one direction and eventually form new species. Some researchers have pointed out that a single gene mutation may significantly affect an individual's facial features, which can occasionally induce facial deformation.
The purpose of life is heredity, and it is the desire to pass on one's genetic material without alteration. Genetic mutations are essentially the result of DNA replication errors and are a completely random "error" that tends to alter or disrupt the function of genes. Only a very small number of mutations, crooked, alter the function of genes, and this change happens to be conducive to the adaptation of organisms to the environment, which is the molecular basis of biological evolution.
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Genetic mutations can be spontaneous or induced. When one base pair in a DNA molecule is replaced by another different base pair, it may cause gene mutations, which are common in all species in nature, no matter what type of mutation, have common characteristics such as randomness, low frequency and reversibility. The external causes of mutations in DNA molecules are:
Physical factors (X-rays, lasers, ultraviolet rays, gamma rays, etc.). Chemical factors (nitrous acid, aflatoxin, base analogues, etc.). Biological factors (certain viruses, bacteria, etc.).
The internal cause of DNA molecular mutation is that the number, order, and type of deoxynucleotides inside the gene are changed locally during DNA replication, thus changing the normal structure of genetic information.
From a genetic point of view, cancer develops from a single cell, and the occurrence of cancer is a very accidental event.
Malignant transformation of cells requires multiple genetic alterations, i.e., multiple genetic mutations in a single cell. Tumorigenesis is therefore a gradual process that involves the accumulation of multi-level reactions and mutations. In this process, cancerous cell lines are increasingly uncontrolled by regulatory mechanisms in vivo and gradually infect normal tissues.
After the malignant transformation of the cells, the cancer cells continue to accumulate mutations, giving the mutant cells new characteristics and making the cancer cells appear to be immortal.
Hello. That's right.
In nature, genetic mutations, genetic recombination, and natural selection all affect changes in gene frequencies. The change of gene frequency is essentially the evolutionary process of organisms, and genetic mutations provide raw materials for evolution. >>>More
It can't be understood that way, these are two different levels of concept. One is from the micro and the other is from the relative macro. Gene mutation only refers to the variation of gene segments, while chromosomal variation is only the change of the entire chromosome, which cannot be measured by genes, there are too many. >>>More
For humans, genetic mutations can be useful or harmful.
Mutagenesis breeding. This is a useful aspect of genetic mutations by inducing a large and diverse number of genetic mutations in organisms, so that excellent varieties can be bred according to needs. Before the discovery of chemical mutagens, radiation was mainly used as a mutagen in plant breeding. After the discovery of chemical mutagens, the means of mutagenesis increased greatly. >>>More
Gene mutations are 1: random 2: not directed 3: low probability 4: mostly harmful. >>>More
You're right. As long as the structure of a gene changes, it is called a gene mutation. A genetic mutation is an addition, deletion, or alteration of base pairs that occurs in a segment of a DNA molecule that has a genetic effect.