If the meiocyte of a maize plant contains 20 chromosomes, then the number of chromosomes in the endosperm and the embryo of the maize grain are 30 and 20 respectively.
We know, if a meiocyte have 20 chromosomes then the gamete cell is half of it, i.e., 2n=20 or n=10, so the gamete will have 10 chromosomes. And the endosperms are triploid in nature, i.e., 3n. Therefore the meiocyte having 20 chromosomes have 30 chromosomes (3×10=30).
And we know, an embryo is diploid in nature, so the embryo of the maize grain will have 20 chromosomes (2×10=20).
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