. Principles of modern biology. Biology. Cell Division in Relation to Reproduction - 53 r — H A P L 0 I D S T A G E S (. SPERMATOCYTES IN TESTIS MITOTIC MULTIPLICATION MEIOSIS STARTING. ANAPHASE 2nd MEIOTIC DIVISION 2nd MEIOTIC DIVISION SPERMATIDS METAMORPHOSIS, NUCLEAR CONDENSATION MATURE SPERM Fig. 3-10. Diagram of meiosis as observed in a testis during the production of sperm. Note that the prophase of the first meiotic division differs in several ways from the prophase of an ordinary mitotic division: (1) it en- dures much longer; (2) it is accompanied by considerable cell growth; and (3)
. Principles of modern biology. Biology. Cell Division in Relation to Reproduction - 53 r — H A P L 0 I D S T A G E S (. SPERMATOCYTES IN TESTIS MITOTIC MULTIPLICATION MEIOSIS STARTING. ANAPHASE 2nd MEIOTIC DIVISION 2nd MEIOTIC DIVISION SPERMATIDS METAMORPHOSIS, NUCLEAR CONDENSATION MATURE SPERM Fig. 3-10. Diagram of meiosis as observed in a testis during the production of sperm. Note that the prophase of the first meiotic division differs in several ways from the prophase of an ordinary mitotic division: (1) it en- dures much longer; (2) it is accompanied by considerable cell growth; and (3) it involves synapsis between the members of each homologous pair of chromosomes. Moreover, the second division is unique in that no replica- tion of the chromosomes takes place and the interphase between the first and second divisions is exceptionally short. Meiosis leads to the production of haploid cells (or nuclei) from diploid progenitors* whereas mitosis trans- mits an unchanged number of chromosomes, either diploid or haploid, to the daughter cells (or nuclei). In mitosis, moreover, the members of the homologous pairs, when pairs are present, do not associate as 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 Marsland, Douglas, 1899-. New York, Holt, Rinehart and Winston
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