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Lateral loops of the amphibian chromosome

The lateral loops originate from chromosomal granules and the lateral branches are not homogeneous in structure, but are made up of smaller particles embedded in a hyaline cylinder. These lateral loops occur in separable clusters of 1 to 9 loops along a single chromonema. These loops reach their greatest development at stage 4, when the chromosome frame is most expanded. They average 9.5 microns in length but may reach 24 microns. They are not resorbed back into the chromosome and the number of loops per chromosome decreases with time, although the number of chromomeres per chromosome remains constant.

Reference

Courtesy, W. R. Duryee, 1950, Ann. N. Y. Acad. ScL, 50, Art. 8.


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Frog Development (1951): 1 Introduction | 2 Rana pipiens | 3 Reproductive System | 4 Fertilization | 5 Cleavage | 6 Blastulation | 7 Gastrulation | 8 Neurulation | 9 Early Embryo Changes | 10 Later Embryo or Larva | 11 Ectodermal Derivatives | 12 Endodermal Derivatives | 13 Mesodermal Derivatives | 14 Summary of Organ Appearance | 15 Glossary | 16 Bibliography | Figures

Reference

Rugh R. Book - The Frog Its Reproduction and Development. (1951) The Blakiston Company.


Cite this page: Hill, M.A. (2024, June 14) Embryology Rugh 041.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Rugh_041.jpg

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current09:00, 12 April 2013Thumbnail for version as of 09:00, 12 April 2013834 × 800 (73 KB)Z8600021 (talk | contribs)==Lateral loops of the amphibian chromosome== The lateral loops originate from chromosomal granules and the lateral branches are not homogeneous in structure, but are made up of smaller particles embedded in a hyaline cylinder. These lateral loops occ...