Volobuev A.N., Natural Selection in a Population is a Problem of Nonlinear Genetics, Journal of Genetic Engineering, Volume 1, Issue 1, 2019, Pages 10-14, ISSN 2694-1198, https://doi.org/10.14302/issn.2694-1198.jge-19-3079. (https://oap-researcharticles.org/jge/article/1220) Abstract: The problem of natural selection against recessive homozygotes in a population is investigated. It is shown that natural selection of mutant alleles linked with the Х-chromosome in a population at women is described by the nonlinear differential equation of the third order. The order of the differential equation characterizes a power of selection. It is marked that the high order of the differential equation of natural selection allows level all mutational processes in Earth populations. Keywords: Hardy-Weinberg’s law; a population; natural selection; nonlinear genetics; a power of selection.