Archive image from page 122 of Cytology (1961). Cytology cytology00wils Year: 1961 Figure 4-22. Diagrammatic Representation of Lampbrush Chromosome Structure. Top. enlargement of portion of single chromosome showing chro- monemata and chromomere with attached lateral loops. Bottom left, a bivalent with homologous chromosomes joined by two chiasmata, and showing paired lateral loops. Bottom right, enlargement of section of single chromosome illustrating the variation in morphology of the chromomeres and loops. (From Gall, J. G., 1956. 'On the Submicroscopic Structure of Chromosomes,' Brookhav
Archive image from page 122 of Cytology (1961). Cytology cytology00wils Year: 1961 Figure 4-22. Diagrammatic Representation of Lampbrush Chromosome Structure. Top. enlargement of portion of single chromosome showing chro- monemata and chromomere with attached lateral loops. Bottom left, a bivalent with homologous chromosomes joined by two chiasmata, and showing paired lateral loops. Bottom right, enlargement of section of single chromosome illustrating the variation in morphology of the chromomeres and loops. (From Gall, J. G., 1956. 'On the Submicroscopic Structure of Chromosomes,' Brookhaven Syinp. Biol., 21, Fig. 7, p. 22, and Fig. 1. p. 18.) SOME BIOCHEMICAL CONSIDERATIONS As already mentioned, the nucleus contains four major chemical constituents: (1) DNA, (2) RNA, (3) proteins, and (4) lipids. DNA Of the chemical constituents of the nucleus, DNA has b?en the most extensively studied in terms of its molecular organization, localization, and function within the nucleus. Biochemical studies have established that the amount of DNA per somatic nucleus is approximately the same STRUCTURE AND FUNCTION OF THE NUCtEUS / 103
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