128 



CYTOLOGY 



CHAP. 



form. He found that in anaphase the daughter chromosomes separate 

 in such a way that their arrangement in the two telophase groups is the 

 same. Thus in Fig. 58, A, one chromosome is bent in a U -shape, so that 

 the two ends lie close together, while the other one is stretched out so 

 that one end lies with the two ends of the first chromosome, while the 

 opposite end is far removed. In D both chromosomes are U-shaped, 



FIG. 58. 



Telophase of the first cleavage mitosis to prophaseof the following mitosis in Ascatis megalocephala univalens. 

 (Boveri, A.Z., 1909.) A, B, C, telophase, resting nucleus and following prophase of a nucleus with the chromo- 

 somes so grouped in telophase that one chromosome end projects by itself while the other three form a common 

 projection ; D, E, F, similar series in a nucleus in which each chromosome is bent upon itself, so that one projec- 

 tion contains the two ends of the one chromosome and another projection those of the other chromosome. 



forming two separate groups of chromosome ends. When the telophase 

 becomes resolved into the resting nucleus it is found that the chromosome 

 ends form projections from the main mass of the nucleus, telophase 

 groups of type A resulting in resting nuclei such as shown in B, where 

 both sister nuclei have one thick and one thin projection (containing 

 three and one chromosome ends respectively). Telophase groups of 



