Fig. 8. Severing of trailing arms during meiosis II also resulted in backward movement of acentric fragments. (A-D) Selected frames from a time-lapse recording of a secondary spermatocyte undergoing anaphase II. (A) Sister chromatids segregating to opposite poles before the operation. (B) A trailing arm (arrowhead) of one of the sex chromosomes was cut. (C) The acentric fragment (arrowhead) moved backwards to make contact with its sister. (D) The fragment moved along with its sister as anaphase was completed. Times are given in minutes and seconds. Bar, 5 µm (D).