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its not anything.
And changes in allele frequency of populations; genes in genomes. Also in the behavioral repertoire of species.
Think frequent. More of the allele in the populations gene pool and there is a change in the alleles frequency. Some goes for less of the allele.
Random change in allele frequency is called genetic drift.
To determine how allele frequency changes
Allele frequencies change randomly each generation. APEX
Yes, the ratios of genotypes for a specific trait can change if allele frequency changes.
All events that result in changes in allele frequencies in populations contribute to evolution. Genetic drift likewise. Genetic drift is no different from all other reproductive variation, save that the term refers to changes that are more or less neutral.
Random changes in allele frequency are due to genetic drift.
The allele frequency of the populations gene pool is changing.
Genetic driftChanges in the frequency of alleles within a population is called genetic drift. Over time, this can cause a significant phenotypic shift from other populations of the same species that have not had the same genetic drift. Given enough time, genetic drift can be significant enough to cause the affected population to be reproductively isolated from the rest of its species and eventually will develop into a new species.
In larger populations there is stronger selection against deleterious traits. The smaller the population, the greater the degree of deleterious traits are accepted.