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Rudimentary double fertilization where one of the two sperm nuclei from the pollen tube fuses with the egg nucleus to form a 2n zygote, and the other fuses with the ventral canal cell nucleus to form a second zygote, which soon degenerates. An example of this process is found in the Gnetophytes, such as Welwitschia mirabilis. [GOC:mtg_sensu, GOC:tb]
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