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

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

For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes.

The resulting cells are called gametes, and contain only half the genetic material of the parent cells.

These gametes are the cells that are prepared for the sexual reproduction of the organism.

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Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form offspring that inherit traits from each parent.

Many species, both plants and animals, have sexual specialization, and their populations are divided into male and female individuals.

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.

In addition to animals, plants, and fungi, other eukaryotes (e.g.

the malaria parasite) also engage in sexual reproduction.

Fungi may also have more complex allelic mating systems, with sexes not accurately described as male, female, or hermaphroditic.