. Fecundation in plants. Plant embryology; Plants, Sex in; Karyokinesis. MITOSIS IN POLLEN MOTHER-CELLS. 21 In Fig. 9, C, on the left, is shown a chromosome in metakinesis, which is fastened to the spindle near the middle. Each daughter seg- ment, which is split longitudinally, is in the form of a U-like Fig. 9.—Heterotypic mitosis. Meta- and anaphases. A, B, C, and F, Lilium. D, Iradescantia. E, Podophyllum. A, metakinesis beginning; viewed from the end, each chromosome is seen to consist of four rods, due to the second longitudinal splitting, which has taken place at right angles to
. Fecundation in plants. Plant embryology; Plants, Sex in; Karyokinesis. MITOSIS IN POLLEN MOTHER-CELLS. 21 In Fig. 9, C, on the left, is shown a chromosome in metakinesis, which is fastened to the spindle near the middle. Each daughter seg- ment, which is split longitudinally, is in the form of a U-like Fig. 9.—Heterotypic mitosis. Meta- and anaphases. A, B, C, and F, Lilium. D, Iradescantia. E, Podophyllum. A, metakinesis beginning; viewed from the end, each chromosome is seen to consist of four rods, due to the second longitudinal splitting, which has taken place at right angles to the tirst. B, metakinesis accomplished; ends of granddaughter chromosomes, which are directed toward equator, ^ diverge, giving rise to the well-known V-shaped elements; in B all chromosomes are fastened to spindle fibers at the ends. C, chromosome on left was in form of an incomplete ring; segments fastened at place of bending; in this case the U- or V-shaped elements owe their form to a bending; the chromosome on the right was attached endwise. D, mature spindle of Tradescantia. E, F, anaphase; the retreating pairs of granddaughter segments are rods hooked at one end, or U's. in which one limb seems a little longer than the other. This chromo- some may oiuginally have been a complete ring, as in Fig. 8, E, in which the segments had separated at one end in advance of the other,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mottier, David Myers. [Washington] The Carnegie Institution of Washington
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