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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.

Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms.

Initially the reproduction was a replicating process that consists in producing new individuals that contain the same genetic information as the original or parent individual.

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

However, no third gamete is known in multicellular animals.

Each cell in the offspring has half the chromosomes of the mother and half of the father.

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

XY sex determination is used by most mammals, and from a comparison between chicken and human, the Z chromosome appeared similar to the autosomal chromosome 9 in human, rather than X or Y, suggesting that the ZW and XY sex-determination systems do not share an origin, but that the sex chromosomes are derived from autosomal chromosomes of the common ancestor of birds and mammals.

A paper from 2004 compared the chicken Z chromosome with platypus X chromosomes and suggested that the two systems are related.

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).

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In complex organisms, the sex organs are the parts that are involved in the production and exchange of gametes in sexual reproduction.For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes.



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