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The gametes produced by an organism are determined by its sex: males produce male gametes (spermatozoa, or sperm, in animals; pollen in plants) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic.

Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.

Sex comprises the arrangements that enable sexual reproduction, and has evolved alongside the reproduction system, starting with similar gametes (isogamy) and progressing to systems that have different gamete types, such as those involving a large female gamete (ovum) and a small male gamete (sperm).

In complex organisms, the sex organs are the parts that are involved in the production and exchange of gametes in sexual reproduction.

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A paper from 2004 compared the chicken Z chromosome with platypus X chromosomes and suggested that the two systems are related.As sexual reproduction developed by way of a long process of evolution, intermediates exist.Bacteria, for instance, reproduce asexually, but undergo a process by which a part of the genetic material of an individual (donor) is transferred to an other (recipient).In addition to animals, plants, and fungi, other eukaryotes (e.g.the malaria parasite) also engage in sexual reproduction.

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