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In sexual reproduction, the genetic material of the offspring comes from two different individuals.As sexual reproduction developed by way of a long process of evolution, intermediates exist.Typically, prior to an asexual division, a cell duplicates its genetic information content, and then divides. In sexual reproduction, there are special kinds of cells that divide without prior duplication of its genetic material, in a process named meiosis.The resulting cells are called gametes, and contain only half the genetic material of the parent cells.Conversely, there are also species in which there is no sexual specialization, and the same individuals both contain masculine and feminine reproductive organs, and they are called hermaphrodites. The reason for the evolution of sex, and the reason(s) it has survived to the present, are still matters of debate.Some of the many plausible theories include: that sex creates variation among offspring, sex helps in the spread of advantageous traits, that sex helps in the removal of disadvantageous traits, and that sex facilitates repair of germ-line DNA.In complex organisms, the sex organs are the parts that are involved in the production and exchange of gametes in sexual reproduction.
Physical differences are often associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.the malaria parasite) also engage in sexual reproduction.