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As sexual reproduction developed by way of a long process of evolution, intermediates exist.

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.

Many species, particularly 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.

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

Diploid organisms can, in turn, form haploid cells (gametes) that randomly contain one of each of the chromosome pairs, via meiosis.


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