What evolutionary factors provide material for natural selection?

An important evolutionary factor is the process of the occurrence of mutations. It delivers evolutionary material – new hereditary changes. Due to the constant action of the mutation process and a large number of genes, the total number of mutant alleles in each individual reaches from several percent to tens. Due to this, the mutation process significantly affects the gene pool of the population. Its pressure is enhanced by combinational variation and gene flow.
Another evolutionary factor supplying material for evolution and changing the gene pool is fluctuations in the number of populations — population waves. With an increase in population, the number of new mutations increases. As a result, the gene pool of the population is enriched with new genotypes. After a decline in numbers, some genotypes accidentally disappear with the death of individuals carrying it, and the concentration of other genotypes also accidentally decreases or increases. After restoration of the population, the gene pool of the population will be different, represented by a different ratio of genotypes.

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