What is the ploidy of PEN ?
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PEN refers to Primary Endosperm Nucleus. Primary endosperm nucleus divides to form endosperm tissue.
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It is triploid (3n). The nucleus of the second male gamete {haploid(1n)} fuses with the polar nuclei {diploid(2n)} in the central cell of the egg apparatus and results in the formation of triploid(3n) primary endospermic nucleus
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