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Cam exchange sexe

The ZW sex-determination system is shared by birds, some fish and some crustaceans.

Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms.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.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.spermatozoa, or sperm, in animals; pollen in seed plants) while females produce large gametes (ova, or egg cells).Individual organisms which produce both male and female gametes are termed hermaphroditic.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.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.

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