What conditions are necessary for asexual reproduction?

Organisms begin asexual reproduction when everything is fine in life. The logic is as follows: you can not strain yourself with the search for a partner and the production of “expensive” germ cells, if the environment is favorable, but split in two (protozoa), or sprout several “daughters” (yeast), or form compact spores (fungi and algae). The evolutionary meaning is as follows: in a stable environment, it is necessary to increase the number of organisms with the same characteristics that are suitable for this environment. If the environment becomes unfavorable, then sexual reproduction helps to reshuffle genotypes and find a solution to the problem in the form of new combinations of genes that will make their carrier more successful in the changed environment.