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The defining characteristic of sexual reproduction in eukaryotes is the difference between the gametes and the binary nature of fertilization.
The gametes produced by an organism define its sex: males produce small gametes (e.g.
spermatozoa, or sperm, in animals; pollen in seed plants) while females produce large gametes (ova, or egg cells).
Among humans and other mammals, males typically carry an X and a Y chromosome (XY), whereas females typically carry two X chromosomes (XX), which are a part of the XY sex-determination system. Other animals have different sex-determination systems, such as the ZW system in birds, the X0 system in insects, and various environmental systems, for example in crustaceans.
Fungi may also have more complex allelic mating systems, with sexes not accurately described as male, female, or hermaphroditic.
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.