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

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.

Sexual reproduction in eukaryotes is a process whereby organisms form offspring that combine genetic traits from both parents.

Chromosomes are passed on from one generation to the next in this process.

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.

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.

This double-chromosome stage is called "diploid", while the single-chromosome stage is "haploid".