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The fusion of nucleus of haploid(n) male gamete with the diploid (2n) secondary nucleus of female gamete. It leads to the formation of triploid (3n) endosperm cell. It is also called triple fusion. Endosperm helps in embryo nourishment.
Female = '6n' number of chromosomes
Male = '4n' number of chromosomes
Female gamete or ploidy of egg = 3n
Male gamete or ploidy of sperm = 2n
During zygote formation, male and female gametes fusion takes place,
2n + 3n = 5n
For endosperm formation,
2 polar nuclei + 1 male gamete = 6n + 2n = 8n.
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