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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.Some of the many plausible theories include: that sex creates variation among offspring, sex helps in the spread of advantageous traits, that sex helps in the removal of disadvantageous traits, and that sex facilitates repair of germ-line DNA.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.the malaria parasite) also engage in sexual reproduction.Some bacteria use conjugation to transfer genetic material between cells; while not the same as sexual reproduction, this also results in the mixture of genetic traits.One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process.

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Multiplicity of gamete types within a species would still be considered a form of sexual reproduction.Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form offspring that inherit traits from each parent.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).

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