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If the diploid number of a flowering plant is 36. what would be the chromosome number in its endosperm

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If the diploid number of a flowering plant is 36. what would be the chromosome number in its endosperm
A. 36
B. 18
C. 54
D. 72
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Endosome is a product of tiple fusion. One male nuclei (n=18) fuses with diploid secondary nucleus (2n=36), so it becomes triplod structure (3n=54) So, ploidy of endosperm is (3n) and chromosomes will be 54
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