. Biophysical science. Biophysics. 10 : 3/ Cellular Events Produced by Ionizing Radiations 191 controls. During mitosis, each chromosome is split and, therefore, the daughter cells have the same character as the original cell. During meiosis, however, the two homologous chromosomes line up together, entwine about one another, and then separate along the spindle to opposite poles. Thus, the egg and sperm cells end up with half the number of chromosomes as the normal body cells. This division is not completely random because each egg or sperm cell con- tains one member of each pair of chromosome
. Biophysical science. Biophysics. 10 : 3/ Cellular Events Produced by Ionizing Radiations 191 controls. During mitosis, each chromosome is split and, therefore, the daughter cells have the same character as the original cell. During meiosis, however, the two homologous chromosomes line up together, entwine about one another, and then separate along the spindle to opposite poles. Thus, the egg and sperm cells end up with half the number of chromosomes as the normal body cells. This division is not completely random because each egg or sperm cell con- tains one member of each pair of chromosomes. When the sperm fertilizes the egg cell, the normal number is re-formed. Figure 3 illus- trates diagrammatically the chromosome changes in meiosis. (a) Interphase. As in Fig. 2(a).. (d) Late anaphase. As in Fig. 2(d), except each daughter cell has half the original number of chromosomes. Crossing over can occur in early anaphase. (e) Telophase. Two haploid cells are formed. Note each chromosome is double 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 Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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