. Animal biology. Zoology; Biology. - Spermatogonia \ r-\ r^\ /^^ / ^, ' r> n L- •^- ' and so on for a very famenumber of cell divisions At^M any one spermatogonium Growth period. Moituration period ,,Synapsis Primary spermatocyte Meiotic division '/ \\ Secondary — J Spermatocyte. Sperm ce/fs Fig. 44.— Diagram illustrating spermatogenesis, the haploid number of chromosomes being four and the diploid eight. is known as a reduction division, or meiosis. The reduced number of chromosomes is known as the haploid number, while the larger number, found in all somatic cells and in all immature ger
. Animal biology. Zoology; Biology. - Spermatogonia \ r-\ r^\ /^^ / ^, ' r> n L- •^- ' and so on for a very famenumber of cell divisions At^M any one spermatogonium Growth period. Moituration period ,,Synapsis Primary spermatocyte Meiotic division '/ \\ Secondary — J Spermatocyte. Sperm ce/fs Fig. 44.— Diagram illustrating spermatogenesis, the haploid number of chromosomes being four and the diploid eight. is known as a reduction division, or meiosis. The reduced number of chromosomes is known as the haploid number, while the larger number, found in all somatic cells and in all immature germ cells, is called the diploid number. Sometimes the reduction occurs in the first of these maturation divisions and sometimes in the second. The spermatids undergo a process of modification or ripening which involves a change in form and also the loss of a considerable amount of. 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 Wolcott, Robert Henry, 1868-1934; University of Nebraska (Lincoln campus). Dept. of Zoology. New York ; London : McGraw-Hill Book Company, Inc.
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