When organisms evolve, does the gene frequency of the population necessarily change?

How exactly does evolution work? In fact, many of the evolutionary metaphors we often use are incorrect. For example, it is the entire species, not the individual organisms, that is able to adapt to the environment and evolve. Genes don't want to be passed on to their offspring, genes don't want anything!

Yes, the definition of biological evolution.

It will evolve by all means according to the textbook.

But if a certain group of individuals dies by accident and the gene frequency changes, there must be no evolution! And if I artificially kill some individuals in a certain group, the gene frequency will also change, but this should not have evolved!

Your question has been answered (meow.

I'm very happy if it is

Not necessarily.

The two cases in the diagram are very different. Both statements are true.

Figures 1 and 2 are about the change that says "never look back", apparently the gene frequency corresponding to one of the phenotypes under some natural selection.

There has been a significant increase and accounts for the vast majority of the population. This is indeed an evolutionary process (but note that it does not necessarily mean new speciation, but it is clear that the new population is at least a subpopulation to the original population (if there is one).

Figure 3 also points out"Directional change".is the essence of evolution. In the case of other factors,Changes in gene frequencies within populations are commonplace

For example, it is possible that individual genes die directly because there are very few individuals, and directly because there are no offspring due to bad luck, but this process is not called evolution, but genetic drift.

Dead genes are not lost by natural selection).

Because gene frequencies do not change, the genotype frequencies of the next generation of newborns will not change. And the frequency of a gene in the population = the total number of genes in the population 100% of the total number of pairs of alleles in the population. Frequency of a genotype in a population = number of individuals of that genotype 100% of the number of individuals in that population.

The gene frequency reflects whether the species has evolved or not, and the genotype frequency reflects certain characteristics and numbers of individuals in a population at a certain time.

Main uses: Gene frequency refers to the proportion of a gene in the total number of alleles in a population's gene pool. The sum of the frequencies of the different genes at a certain locus and the frequencies of the various genotypes in a population is equal to 1.

For a population, the gene frequency of the population is ideally stable from generation to generation, but under natural conditions, it is affected by genetic mutation, genetic recombination, natural selection, migration and genetic drift, and the gene frequency of the population is constantly changing, so that the organisms continue to develop and evolve. Therefore, it is useful to understand the evolution of a population by calculating the gene frequencies of that population.

New speciation is the result of evolution.

The essence of evolution is the result of changes in gene frequency.

Hope it helps!

I think all scientific theorems are summaries of real experience, and they are never absolute. The situation mentioned by the subject is too ideal, and a series of issues such as the fertility of tetraploid, its own ability to grow and develop, and changes in other genes should be considered.

Despite the reproductive isolation of tetraploid and diploid wheat, scientists still classify them as subspecies of the same species (does treatment with colchicine necessarily produce a "new species"?). This suggests that there are exceptions to scientific theorems and definitions, especially in the biological sciences. Perhaps the emergence of exceptions is the first step in refining the theory.

All in all, I think this question can only be answered through specific research (and maybe the answer is already there).

Why? The change of gene frequency is a sign of evolution, evolution does not necessarily produce new species, since there is reproductive isolation between the new species and the original population (species), it is not a gene pool, there is no way to talk about the change of gene frequency, if you have to ask, yes.

Under the effect of natural selection, individuals with favorable variation have more chances to produce offspring, and the frequency of corresponding genes in the population will continue to increase. Conversely, individuals with unfavorable variants have fewer chances of leaving offspring, and the frequency of the corresponding gene in the population decreases. Therefore, under the action of natural selection, the gene frequencies of the population will undergo directional changes, resulting in the continuous evolution of organisms in a certain direction.

Suppose there are two alleles A and A on a locus in a diploid organism, and assuming that there are n individuals in the population, and the number of individuals in the three genotypes of AA, AA, and AA are N1, N2, and N3 respectively, then the frequencies of gene A and the frequencies of AA genotypes in the population are respectively

Frequency of genes a= total number of genes a(total number of genes a+total number of genes a) = (2n1+n2) 2n or n1 n+n2 2n

Frequency of aa genotype = number of individuals of aa genotype Total number of this diploid population = n1 n.

The relationship between gene frequency and genotype frequency is deduced from the above: the frequency of gene a = n1 n + 1 2·n2 n = frequency of aa genotype + frequency of 1 2·aa genotype.

Be! To put it simply, organisms are constantly evolving, and genes are constantly changing.

Because in the process of evolution, organisms survive the fittest, and the organisms that are not adapted to survive in the environment are eliminated, and of course, the genes in such organisms will also be eliminated.

In the same way, in order to adapt to the living environment, organisms will continue to evolve, and in the process of evolution, genes have also mutated, most of the mutations are harmful, and a small number of favorable mutations will survive.

Therefore, in the process of continuous evolution, gene frequencies also change.

It's impossible, but it's okay to do it the other way around. If you are in high school, it is recommended that you understand the formula I wrote next with you to avoid confusion.

Suppose there are two alleles A and A on a locus in a diploid organism, and assuming that there are n individuals in the population, and the number of individuals in the three genotypes of AA, AA, and AA are N1, N2, and N3 respectively, then the frequencies of gene A and the frequencies of AA genotypes in the population are respectively

Frequency of genes a= total number of genes a(total number of genes a+total number of genes a) = (2n1+n2) 2n or n1 n+n2 2n

Frequency of aa genotype = number of individuals of aa genotype Total number of this diploid population = n1 n.

The relationship between gene frequency and genotype frequency is deduced from the above: the frequency of gene a = n1 n + 1 2·n2 n = frequency of aa genotype + frequency of 1 2·aa genotype.

Explain contingency: that is, the gene frequency of the population should not change, but it changes suddenly, that is, if there are 10,000 individuals in the population, then the change of one will not affect anything, because it will soon be masked, but if there are only two individuals, then the change may be inherited forever, which is an accidental change.

Because when the population declines, there are few individuals of each genotype, and a gene is likely to be lost due to the accidental death of individuals of its genotype, so the chance of this change increases.

When the denominator is infinite, the change of the numerator has almost no effect on the value of the fraction, and the decrease of the denominator will affect the value of the fraction.

Suppose there are 10,000 long-winged fruit flies, and one of them becomes a stump wing, and the gene frequency changes to 10,000.

1. Suppose there are 10 long-winged fruit flies, and one of them has a stump that becomes a stump wing, and the gene frequency changes to one-tenth I don't know, so you can understand it