Once upon a time a man became a great archer(射手).He asked the king to declare him as the greatest archer of the country. The king was about to do so when an old servant of the king said，“Wait，sir.I know an old man who lives in the forest. He is a much greater archer. Let this young man go to him and learn from him for at least three years.”
   The man could not believe that there could be a greater archer than him，but he went and found the old man and he was! For three years he learned from him.Then one day，when he thought he had learned everything，the thought arose in him：“If I kill this old man，then I will be the greatest archer.”
   The old man had gone to cut wood and he was coming back carrying wood on his shoulder. The young man hid behind a tree,waiting to kill him. He shot an arrow(箭). The old man took a small piece of wood and threw it.It struck the arrow and the arrow turned back and wounded the young man.The old man came，took out the arrow and said.“I knew that some day or other you were going to do this. That's why I have not taught you this secret. There is no need to kill me. My master is still alive,and I'm nothing before him. You must be with him for at least thirty years. And he is very old，So go fast! Find the old man!”

根据题意完成下列填空：

如图是某动物精子形成过程中的一组细胞示意图．请回答下列问题：

（1）图①所示的细胞处于减数第____ 次分裂，此时细胞内有____ 对同源染色体．

（2）没有姐妹染色单体的细胞是图____ 和____ 　，该动物体细胞内有____ 条染色体．

A．电源（电动势3V，内阻约1Ω）

B．电流表（0～0.6A，内阻约1Ω）

C．电流表（0～2A，内阻约0.4Ω）

D．电压表（0～3V，内阻约10kΩ）

E．电压表（0～10V，内阻约20kΩ）

F．滑动变阻器（0～5Ω，额定电流3A）

G．滑动变阻器（0～500Ω，额定电流2A）H．开关、导线