What would have happened if any of the cells in nature had not been divided by meiosis ?

Explanation

a. During meiosis , reduction division produces four haploid cells ( gamets i.e., human sperm cell and egg cell ) from a single diploid cell. Hence, if meiosis does not occur, it will result in doubling of chromosomes in each successive generation, which will result in formation of abnormalities.
b. If meiosis does not occur, the chromososme number of parents and their offsprings will differ in every generation, hence no species will hold its characters.
c. Also, there will be no crossing over of homologous chromosomes. Thus, there will be no variations with respect to the changing environment in progency to maintain their existence , which may lead to extinction of species.