. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. N. A' (â¢;,;.;â¢.â .â¢â¢;â¢:.:/:.â¢â â¢.â¢.â¢â .â .â¢.â :â .â¢..â ..) A. 8. A. B. A. B. flHT'^^^^H'.'V :';-:: ^^^^^^^B B' Fig. 70. Some of the various possibilities which may occur as a result of the exchanges of parts of chromatids during the crossing-over phenomena associated with meiosis. Two chiasmata (singular, chiasma) are shown in (A), (C), (E). Observe that homologous chromosome A has split equationaliy into chromatids A and A
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. N. A' (â¢;,;.;â¢.â .â¢â¢;â¢:.:/:.â¢â â¢.â¢.â¢â .â .â¢.â :â .â¢..â ..) A. 8. A. B. A. B. flHT'^^^^H'.'V :';-:: ^^^^^^^B B' Fig. 70. Some of the various possibilities which may occur as a result of the exchanges of parts of chromatids during the crossing-over phenomena associated with meiosis. Two chiasmata (singular, chiasma) are shown in (A), (C), (E). Observe that homologous chromosome A has split equationaliy into chromatids A and A', while homologous chromosome B has divided equationaliy into B and B'. The resulting interchanges be- tween respective chromatids of the original homologous chromosomes are shown in (B), (D), (F). The kinetochore (place of spindle-fiber attachment) is indicated by the oval or circular area to the left of the chromatids. (Modified from White: Animal Cytology and Evolution, London, Cambridge University Press, 1943.) 134. 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 Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston
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