Machine Drift Edit stochastic genetic drift (random genetics drift) is genetic drift (genetic drift), because of some random factor, the frequency of a first-class gene in the population (especially in small groups) in the generation of transmission of the wave phenomenon. 2 Reasons to edit this fluctuation results in the disappearance of some alleles, and the fixation of other alleles, thus altering the genetic structure of the population . In large population, the fluctuation of the number of children born by different genotype has no significant effect on gene frequency. Small groups of people, and isolated from the total population, this social and geographical factors form a small group, a gene fixation (a=1), and a gene is very few people, a gene, if no children, the A gene will be relatively fast disappearing in the population, resulting in the small population of the gene frequency fluctuations. This drift is related to the population size, the smaller the population, the faster the drift, even the 1-2 generation of a gene fixation and the disappearance of another gene changes its genetic structure, and large group drift is slow, can randomly achieve genetic balance. [1] 3 Reality example Editor for example : In a population, the frequency of a gene is 1%, if the population has 1 million individuals, there are thousands of individuals with this gene. If this population has only 50 individuals, then only 1 individuals have this gene. In this case, the gene may be lost in the population due to accidental death or non-mating of the individual. This phenomenon is genetic drift. some abnormal gene frequencies are particularly high in small isolated populations, possibly due to the fact that a few of the ancestors in the group have genes that are gradually reaching higher levels due to genetic drift, a phenomenon known as the founder effect (founder effect). For example, 5% of people in East Carolina Island of the Pacific are suffering from congenital blindness. According to the investigation, at the end of 18th century, due to typhoon attack, the island only 30 people, from their breeding into today more than 1600 small groups, the 5% color blindness, may be only the first 30 people who build a person is a carrier, the gene frequency q=1/60=0.016, after several generations of isolation and reproduction, Q quickly rises to 0.22, which is the creator effect
Random drift-change random genetics drift
