. The physical basis of heredity . Fio. 44.—Spcrmatagonial cells in the last phase of division, a, and the following restingstages, b, d. (After Wenrich.) sion the vesicles become more distinct (Fig. 45, a,h), andsoon a coiled thread can be seen to be present in eachvesicle (Fig. 45, c). As the thread thickens (Fig. 45, ^),a longitudinal split appears in it, which indicates the planeof division of each chromosome at the next division. At the last spermatogonial division, the chromosomesof the two daughter nuclei form vesicles, as thej^ have donein earlier divisions (Fig. 4(3, a and h). But cha
. The physical basis of heredity . Fio. 44.—Spcrmatagonial cells in the last phase of division, a, and the following restingstages, b, d. (After Wenrich.) sion the vesicles become more distinct (Fig. 45, a,h), andsoon a coiled thread can be seen to be present in eachvesicle (Fig. 45, c). As the thread thickens (Fig. 45, ^),a longitudinal split appears in it, which indicates the planeof division of each chromosome at the next division. At the last spermatogonial division, the chromosomesof the two daughter nuclei form vesicles, as thej^ have donein earlier divisions (Fig. 4(3, a and h). But changes beginto take place that carry the chromosomes through a verydifferent series of stages from those seen in preparations 106 PHYSICAL BASIS OF HEREDITY.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectheredit, bookyear1919
