Sexual reproduction is a process in which gametes (male and female) are exchanged for the generation of one or more individuals of the same species. Individuals born of this reproduction are similar to their parents, but not identical to any of them.
The advantages of this type of reproduction is mainly the genetic diversity of individuals that ensures more secreted genes in future generations. Even organisms that make asexual reproduction also rely on sexual reproduction at some point in their existence. This, however, does not apply to one hundred percent of asexual reproduction organisms.
Then the population is evolving. If a population is not in Hardy-Weinberg equilibrium, then it is evolving. Evolution (microevolution) is a change in allele frequencies across generations.
