Which of the following processes is a result of environmental pressure on the genotypic variation in populations?

The process that results from environmental pressure on genetic variation within populations is evolution. Evolution refers to the change in heritable traits of a population over successive generations, often driven by mechanisms such as natural selection, genetic drift, and gene flow.

In the context of environmental pressures, individuals with traits that confer an advantage in a particular environment are more likely to survive and reproduce. This differential survival and reproduction leads to a shift in the genotypic and phenotypic composition of the population over time. The variations that exist within a population, which stem from genetic differences, provide the raw material upon which evolutionary forces act.

In contrast, meiosis and mitosis are processes of cell division; meiosis generates genetic diversity through the formation of gametes and sexual reproduction combines genetic material from two parents but does not directly result from environmental pressures. Thus, while these processes contribute to genetic variation, they are not the end result of environmental pressures acting on that variation as evolution is.