下列现象属于反射的是（　　）

袋中装有大小相同的总数为5的黑球、白球，若从袋中任意摸出2个球，得到的都是白球的概率是 ，则至少得到1个白球的概率是____.

    Everybody, welcome to ____(we) company. I am Luisa, Director of the department. Let me say something to you all. The starting of work can be exciting on the hand, and can also be ____(worry) on the other. No matter what your future job is, you will have to work with others. Leaning to get on well with others must come first,____ (include) all staff in the company and our ____ (custom).

    And secondly, right after my introduction, spend some time reading the introduction of our company and get to know the people in your office and find out ____ the company is like. This afternoon you can walk around our workshops and know ____ (much) about the products. No one is allowed ____ (leave) the company before 5:30 pm. By the way, lunchtime ____ (come) at 11:50 and it's free ____ charge.

    Remember: Learning is so important ____ it can change your future life.

This is what I'd like to say to you at the moment. If you still have any question, please come to my office. Thank you.

如图甲、乙分别表示某基因组成为AaBbdd的雌性高等动物细胞分裂过程中某时期的染色体基因示意图和配子形成时细胞中染色体数量变化曲线图．

请据图回答：

（1）依据图乙，写出该种生物细胞分裂时，DNA数目的变化规律：____ ．

（2）图甲所示细胞所处的时期是____ ，其分裂完成产生的子细胞的名称为____ ．该细胞中含同源染色体____ 对．若1号染色体表示X染色体，则2号和4号染色体分别叫做____ 、____ ．

（3）孟德尔的遗传定律是通过减数第一次分裂后期的____ 来实现的．

（4）图乙中的横坐标各数字中，____ 表示基因b和b的分开时期．