A few questions about genetics, is gene genetic?

Problem 1: The dominant and recessive nature of genes is not absolute.

For example: a flower color gene (because what flowers I forget, but actually there are) when it.

When the genotype is AA, the flower color is red, and when the genotype is AA, the flower color is pink, when the base.

When the cause type is AA, the color of the suit is white, and although A is the dominant gene, this gene is not.

100% dominant.

Question 2: There are good and bad things to evolution.

Let's use people as an analogy! The human color blindness gene is recessive, without this recessive group.

Because human beings do not have color blindness; However, human polydactyly disease, antivitamin D rickets, soft.

Bone hypoplasia is a disease caused by dominant genes, and recessive genes are much better than dominant genes.

Finish! At the same time, the same organism will have different traits because of the presence of recessive genes.

Realized! Question 3: It seems to be born with it!

When both dominant and recessive genes exist, what is translated into mRNA is the dominant and recessive gene.

It will not be translated, so it can be said that it is the result of genetic selection and expression!

Not exactly! Because the hare's antiviral gene is due to a genetic mutation! Although there may be this gene at the beginning, it is not certain that it must be a recessive gene, because the frequency of mutations is very low, so the number of this disease resistance gene is not much, even if sexual reproduction can be passed on to the next generation, but individuals with this gene may also die for various reasons, in short, the gene mutated from this gene, the frequency is very low when there are no appropriate conditions, but when there are conditions, I think it is this virus, This virus can only survive in individuals with disease-resistant genes, and those without disease-resistant genes will die, which will increase the frequency of disease-resistant genes!

Although it can also be said as you understand it (the hare itself does not know the "potential" it has, it may be that the sick parents eventually gave birth to a healthy next generation that can realize the "potential" when they cannot choose), because in the absence of the right conditions, this gene is neither harmful nor beneficial, so it will not play a role, and it will only play a role after the emergence of the virus, but your understanding needs to be changed, that is, this disease resistance gene is already there, not because a companion died because of the virus"Create"Disease resistance genes, and in the end this gene will be expressed in large quantities because of natural selection!

The first question, 1, first clarify the difference between explicit and implicit.

Recessive genes are genes that correspond to traits that heterozygous children do not exhibit in their offspring.

2 Recessive genes do not mean that they are all disease genes.

For example, some of the disease resistance traits in plants are controlled by recessive traits.

The second question is to be looked at in detail.

Some genes are mutated to produce alleles that are suitable for the environment, and then they are selected by natural selection to be good for biological evolution, while others are not conducive to the survival of organisms, and they are naturally eliminated, and if the recessive trait adapts to the environment, it will be selected, and vice versa.

The third problem is that there is no such thing as a recessive gene losing to a dominant gene.

1.The dominant and recessive nature of genes is relative.

Dominant genes seem to always be dominant, and recessive genes are always recessive. Absolutely. This is just a code name given to these genes by humans, and then it is not a recessive gene that will not be reflected.

For example, blood type, as opposed to the dominant gene), o is the recessive gene. But it doesn't mean that both parents have a blood type of B, so you can't have a child with a blood type of 0!

There are three genes for blood: IA, IB, and I, and each person has two genes.

There are two types of blood type B, which are (genetic) IB, IB or IB, I;

There are also two types of blood type A, which are (genetic) IA, IA or IA, I;

There is 1 type of blood type O, and the gene can only be I; i

There is 1 type AB, and the genes can only be IA and IB

You and your wife are both type B, and the offspring are (randomly) drawn from the blood group genes of the parents, because there are two types of blood type B, and the child born with blood type B may have the gene IB, and IB may also be IB, IA child with blood type O inherits an I from his parents' genes, and his gene is i,i (i.e., type O).

2。Recessive genes certainly help in the evolution of organisms. If it doesn't help, then you don't need people with blood type 0. This is also one reason why there is a great variety of organisms.

3.How do the two genes compete to make themselves dominant, and how do recessive genes lose to dominant genes?

The result of natural selection. Darwinian evolution, the result of survival of the fittest.

Question 1: Absolutely.

Problem 2: Recessive genes are also two-faced, with benefits and disadvantages.

Question 3: This is not a competition between genes, but natural selection.

For example, if there are 100 rats in a population, there are 10 white and 90 black, and the white is recessive, and then spoofed, if the owl only eats the black ones, the proportion of black mice in the population will be less and less. White will surpass black. If the owl only eats white, it will have less white, which can be understood as losing to black.

This hobby of owls can be understood as a natural choice.

There is no genetic inheritance of good or bad school performance.

As long as your parents are not close relatives, your congenital conditions are fine, learning ability and acquired have a greater relationship, the cultivation of the family, personal efforts can open the gap in learning ability, you blame the gene to not be cautious, your family did not cultivate you, you did not work hard. Your own problems are the key to this.

Inherited genes, also known as genetic factors, are chemicals with complex structures that determine the genetic characteristics of living organisms. In 1953, American geneticist Watson and British biophysicists Crick and Wilkins discovered that in the 46 chromosomes of a human fertilized egg, a chemical containing deoxyribonucleic acid (DNA) is called a gene.

It is the main material basis for storing and transmitting genetic information and replicating cells. There is a chemical mechanism involved in the storage and transmission of genetic information from one cell to the next and from an individual to its offspring. Watson and Crick created a structural model of DNA to explain this mechanism.

Genetics hide the secrets of life and its history, and are born during the evolution of biochemical systems.

Genes have two characteristics, one is the ability to faithfully replicate themselves in order to maintain the basic characteristics of living things; The second is that the filial piety gene can be "mutated", and the vast majority of mutations will cause diseases, and the other small part is non-pathogenic mutations. Non-pathogenic mutations bring raw material to natural selection, allowing organisms to be selected from natural selection to select the most suitable individuals for nature.

The base sequence makes up the genes, and the DNA is made up of an infinite number of genes.

Each DNA has a different base sequence, so each DNA molecule is specific.

Genes are carriers of genetic information.

Answer: "Gene" is the transliteration of English "gene", which is a general term for a nucleotide sequence containing specific genetic information in a DNA (deoxyribonucleic acid) molecule, a DNA molecular fragment with genetic effects, a basic genetic unit that controls biological traits, and a code of life, recording and transmitting genetic information. All genes are made up of 4 bases.

The earth's organisms include animals, plants, and microorganisms, which are huge, diverse, and diverse, with different living environments and living habits, all of which are controlled by genes. "Plant melons and get melons, sow beans and get beans" is a high-level generalization of this phenomenon, that is, the biological characteristics and characteristics of species are determined by genes and can be inherited. A gene encodes a protein, and the function of the protein determines the characteristic properties that an organism exhibits.

From the perspective of the history of genetics, the concept of genes can be roughly divided into the following stages: the pangene (or pregenetic) stage, Mendel's genetic stage, Morgan's genetic stage, cistronic, operon stage, and modern genetic stage. The modern genetic stage is actually a recognizance.

DNA is a biological macromolecule, which is composed of four deoxynucleotide molecules in a certain number and order, and is a long chain molecule;

A gene is a fragment of a DNA molecule that has specific genetic effects. There are many genes on one DNA molecule.

Answer B should be chosen

Solution: The gene code for albinism is A, and color blindness is B

According to the inscription, it can be seen that the father's gene is AAX(b)y, and the mother is AAX(b)X(b), so the types of offspring born to them are: male: normal:

1 16 AAX (B) Y

1 8 AAX(b)y albinism gene carriers.

Monochromaticity: 1 in 16 AAX (B) Y

2 16 AAX(b)y albinism gene carriers.

Monoalbinism: 1 in 16 AAX (b) y

Both suffer: 1 16 AAX (b) Y female: Normal:

1 16 aax(b)x(b).

1 16 of aax(b)x(b) color blindness and albinism gene carriers.

1 8 aax(b)x(b).

1 8 of aax(b)x(b) color blindness and albinism gene carriers.

Color blindness: 1 in 16 AAX (b) x (b).

1 16 of the AAX (b) x (b) albinism gene carriers Therefore, the normal proportion of children born to the couple is 9 16, and answer b should be chosen.

There are two ways to solve this problem, if you want to know the detailed method, you can call me hi

The policy of avoiding consanguineous marriages is not about avoiding genetic malformations between close relatives. Consanguineous marriage is very harmful because it can lead to serious genetic diseases. Because the human genome is under selective pressure, it can lead to mutations in non-conserved loci, resulting in alleles.

There is a distinction between dominant and recessive alleles. Often the pathogenic recessive gene does not exhibit a pathogenic effect when it is present in the body, it is masked by the dominant gene. In the ordinary way of marriage, due to the distance of blood, the probability that both husband and wife have pathogenic recessive genes on the same gene at the same time is very small, and it is difficult for two recessive genes to exist in the child at the same time after the union of the two parties.

If 2 recessive genes are present at the same time, then the child has a genetic disorder. Close relatives are very different on this issue. There is a high probability that both children will have the same recessive gene at the same locus, and 25% of children will be affected.

If it is a genetic disorder of the sex chromosomes, then the probability is higher. So avoid consanguineous marriages.

The so-called three generations away is a probability calculation result, and the probability of such a marriage is roughly equal to that of a normal population. Therefore, to prevent the marriage of collateral blood relatives and immediate relatives within 3 generations, it is to greatly reduce the high incidence of genetic diseases caused by blood proximity.

Genetic variations can occur within a generation. But to make this gene ubiquitous in the whole population, this is an incalculable result, some variants are favorable, there is little selection pressure, the gene frequency rises quickly, and some mutations are harmful, causing death, and the production disappears...

Genetic variation? oh ,no.

Variation is not directional, which means that the direction and type of variation are not determined for each generation.

This does not allow for a fixed formula.

And after how many generations - this one is almost impossible to complete.

Because it is impossible to control so many generations not to marry each other.

Some fragments of human beings are very similar.

And the change in environment has led to a myriad of genetic mutations

I can't control the environment and the subject doesn't change in any way.

So it can be said that there is no standard answer to the landlord's question.

There is an explanation, but it doesn't make much sense.

Genetic disorders are not just genetic.

Hello, what do you mean by breakthrough? Does it mean when cousins can get married? This is unlikely, even if science allows, ethics will not marry within three generations to reduce the incidence of recessive genetic diseases Recessive genes are produced by continuous mutation and the probability of having the same recessive genes within the family is high, so it is not allowed to marry within three generations Other questions are occasionally a little unintelligible I'm glad to answer them.