File:Contributions from the Botanical Laboratory, vol. 7 (1892) (20688115985).jpg

Title: Contributions from the Botanical Laboratory, vol. 7
Identifier: contributionsfro07univ (find matches)
Year: 1892 (1890s)
Authors: University of Pennsylvania. Botanical Laboratory
Subjects: Botany; Botany
Publisher: Philadelphia : University of Pennsylvania Press
Contributing Library: Penn State University
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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270 INTERNATIONAL CONGRESS OF PLANT SCIENCES CONGRESS OF PLANT SCIENCES PLATE I Explanation of Plate PLATE I MODELS OF THREE TYPES OF FIRST MATURATION DIVISION CHROMOSOMES IN GASTERIA Fig. 1. Late anaphase, long chromosomes of closely subterminal type, viewed from outside the spindle, with the tetrad split widely open. Fig. 2. Early anaphase, the same type of chromosome and position, the tetrad split partly opened. Fig. 3. Metaphase, the same type of chromosome and position, the metaphase tetrad character visible but the elements in contact. Fig. 4. Late anaphase, the same type of chromosome from the side, showing primarily the separation of the homologs, but the division of each of these recognizable on the right. Fig. 5. Early anaphase, the same type of chromosome and position, the separation of the homologs evident, the splitting largely obscured because of the position. Fig. 6. Metaphase, the same type of chromosome and position, the homologs in contact, but almost no trace of the tetrad character visible. Fig. 7. Late anaphase, the small chromosome type, viewed from outside the spindle, with the tetrad splits nearly completed. Fig. 8. Early anaphase, the same type of chromosome and position, the tetrad character evident. Fig. 9. Metaphase, the same type of chromosome and position, the tetrad charaaer visible but the elements in contact. Fig. 10. Late anaphase, the same type of chromosome nearly from side view, showing primarily the separation of the homologs, but the division of each of these recognizable on the left. Fig. 11. Early anaphase, the same type of chromosome and position, the separation of the homologs beginning, the splitting of these obscured by the position. Fig. 12. Metaphase, the same type of chromosome and position, the homologs in contact and the tetrad character invisible. Fig. 13. Late anaphase, long chromosomes with fiber attachment a considerable distance from the tip, viewed from outside the spindle, with the tetrad splits widely open. Fig. 14. Early anaphase, the same type of chromosome and position, the tetrad splits partly opened. Fig. 15. Metaphase, the same type of chromosome and position, the metaphase tetrad character visible but the elements in contact. Fig. 16. Late anaphase, the same type of chromosome obliquely from the side, showing primarily the separation of the homologs, but the division of each of these recognizable on the right. Fig. 17. Early anaphase, the same type of chromosome and position, the separation of the homologs evident, the splitting largely obscured because of the position. Fig. 18. Metaphase, the same type of chromosome from the side, the homologs in contact, but no trace of the tetrad character visible. /
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Taylor: C'hromosomkStricturk

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