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The pollen is normal. The haploid number of chromosomes is 12. 2. The third division in the embryo sac shows the diploid number of chromosomes to be 24. 3. Usually the ordinary 8-nucleate sac is organized, but occasionally antipodals organize in the micropylar end and the egg apparatus at the side of the sac, sometimes more than one egg organizing. 4. Two male nuclei come into the sac with the pollen tube, one fusing with the two polars, the other entering the egg but never fusing with it, and finally disintegrating during the first division in the egg. 5. A diploid egg seems to be incapable of fertilization.
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Lula Pace (1913) studied this question.
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