. Biophysical science. Biophysics. (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 (b) Late prophase. As in Fig. 2(b). Cell is called diploid. Metaphase. Homologous chromosomes pair up at centromeres and line up along equatorial plane. Pairs twist around each other, forming 4 -stranded groups. Crossing over can occur. (f) Haploid cells grow and undergo mitosis, resulting in four haploid cells. Chromosomes ar
. Biophysical science. Biophysics. (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 (b) Late prophase. As in Fig. 2(b). Cell is called diploid. Metaphase. Homologous chromosomes pair up at centromeres and line up along equatorial plane. Pairs twist around each other, forming 4 -stranded groups. Crossing over can occur. (f) Haploid cells grow and undergo mitosis, resulting in four haploid cells. Chromosomes are shown within these for diagrammatic purposes. Some of the last 4 grow, forming double-stranded chromosomes and becoming the active cells of sexual reproduction. Figure 3. Note that if there are pairs of homologous chromo- somes, the cell is called diploid, whereas if there are only half this number of chromosomes, the cell is called haploid. For discussion of crossovers, see Figure 4. Modified from Life : An Introduction to Biology by G. G. Simpsom, C. S. P. Hendrigh, and L. H. Tiffany, © 1957, by Harcourt, Brace & World, 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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