Which is usually considered a disadvantage of asexual reproduction? it is a fast method of reproduction. it produces a large number of offspring. it requires two parents. too much variability in the phenotypic expression it produces identical offspring.

A disadvantage of asexual reproduction is that it produces identical offspring. It reduces the amount of genetic diversity in a population. This is harmful as if there's something that drastically affects a member of the population due to it's genes, it may affect the rest of the population as well. Hope this helped :))

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.