Formation of gymnosperm seeds
How the gymnosperm seeds are formed? What are the ploidies of structures which composed of the seeds?
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Their seeds are formed through the differentiation of megasporangia inside the female strobiles (cones). After an oosphere gets fecundated, female gametophyte creates the haploid (n) primary endosperm, a nutritive tissue which covers the embryo and the covering of megasporangium turns into the diploid (2n) seed shell.
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