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Other animals have a sex-determination system as well, such as the ZW sex-determination system in birds, and the X0 sex-determination system in insects.The gametes produced by an organism are determined by its sex: males produce male gametes (spermatozoa, or sperm, in animals; pollen in plants) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic.In sexual reproduction, the genetic material of the offspring comes from two different individuals.As sexual reproduction developed by way of a long process of evolution, intermediates exist.A paper from 2004 compared the chicken Z chromosome with platypus X chromosomes and suggested that the two systems are related.Sexual reproduction in eukaryotes is a process whereby organisms form offspring that combine genetic traits from both parents.One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process.Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms.

Multiplicity of gamete types within a species would still be considered a form of sexual reproduction.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).Among humans and other mammals, males typically carry XY chromosomes, whereas females typically carry XX chromosomes, which are a part of the XY sex-determination system.Chromosomes are passed on from one generation to the next in this process.Each cell in the offspring has half the chromosomes of the mother and half of the father.

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

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