If you have accounts in several 401(k) or other employer-sponsored plans, the IRS generally requires you to calculate a separate RMD for each retirement plan in which you participate and withdraw the appropriate distribution from each plan.
The situation resembles a stalemate in which the genes essentially do not change. Duplication resolves this conflict by allowing each duplicated gene to perform a singular function. The overall function of the genes in a given pathway is preserved, and now mutations in the genes can be selected for that will optimize that specific function.
Evolution is a change in the gene pool of a population over time; it can occur due to several factors. Three mechanisms add new alleles to the gene pool: mutation, recombination and gene flow. Two mechanisms remove alleles, genetic drift and natural selection.