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The endosperm is formed by a fusion between the _______ and _______.'

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The endosperm is formed by a fusion between the sperm nucleus and two haploid polar nuclei.

Endosperm is a tissue surrounding the embryo of flowering plant seeds, which provides nutrition to the developing embryo. Endosperm formation involves double fertilization. There is fertilization of one sperm nucleus to produce a zygote, while the other sperm nucleus fuses with two haploid polar nuclei to form an endosperm cell. Endosperm is triploid because three cells are fused together.

User Lewray
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I'm pretty sure, that there should be an options to choose. Anyway, I know the answer: The endosperm is formed by a fusion between the polar nuclei and the sperm nucleus.
User Joeyjoejoe
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