The "halves" of an individual peanut, which represent its cotyledons, develop from the fertilized zygote and are composed of

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The cotyledons of a peanut are the embryonic leaves that serve as the primary source of nutrients for the developing embryo. They develop from the diploid embryo sporophyte cells that result from fertilization of the egg cell by the sperm cell. The endosperm, which in peanuts is comprised primarily of triploid cells, also provides nutrients for the developing embryo but does not contribute to the cotyledons.

The "Halves" of an Individual Peanut, Which Represent Its Cotyledons