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If the male plant is tetraploid and female plant is diploid, what will be the ploidy level of endosperm after fertilization?
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4n
Endosperm is formed by union of female central cell with male gamete. Diploid female plant will form haploid female gametophyte and large central cell with two polar nuclei giving 2n stage. Tetraploid male plant will produce 2n male gamete. When zn male gamete fuse with two polar nuclei of central cell of female it will form endosperm with ploidy level 4n.
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