Which of the following does not lead to the formation of aneuploid gametes? A: Failure of homologous pairs to separate at anaphase B: A mutatation in a single gene located on chromosome 2. C: A pair of sex chromosomes that does not separate during anaphase D: A set of sister chromotids that doest not separate during anaphase I

胞质分裂开始于有丝分裂（ ），完成于有丝分裂的（ ） A: 前期（prophase）、中期 （metaphase） B: 前期（prophase）、后期(anaphase) C: 中期（metaphase）、末期(telophase) D: 前期（prophase）、末期(telophase) E: 后期(anaphase)、末期(telophase)

Which of the following descriptions about anaphase is CORRECT?() A: The<br/>kinetochore microtubules are shortened by de-polymerization B: Microtubules<br/>attach to kinetochore of chromosomes C: The<br/>separated chromatids move to opposite spindle poles D: The<br/>shape of cell is stretched during the latter part of anaphase

The eggs discharged from the ovaries are at:() A: First meiosis metaphase B: Second meiosis prophase C: First meiosis prophase D: Second meiosis metaphase E: Second meiosis anaphase

Which<br/>of the following cell cycle descriptions is CORRECT? () A: DNA are replicated during the G2 phase. B: Interphase is when the cell spends most of its time performing its<br/>cell functions. C: The interphase consists of prophase, metaphase, anaphase, and<br/>telophase. D: Cell prepare itself for mitosis during S phase