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Individual organisms which produce both male and female gametes are termed hermaphroditic.

Gametes can be identical in form and function (known as isogamy), but, in many cases, an asymmetry has evolved such that two different types of gametes (heterogametes) exist (known as anisogamy).

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.

The defining characteristic of sexual reproduction in eukaryotes is the difference between the gametes and the binary nature of fertilization.

Multiplicity of gamete types within a species would still be considered a form of sexual reproduction.

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).the malaria parasite) also engage in sexual reproduction.Some bacteria use conjugation to transfer genetic material between cells; while not the same as sexual reproduction, this also results in the mixture of genetic traits.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.