Core Questions Cell Reproduction

1. Using the above diagram, which event most likely occurs next in the cell cycle A. The chromatin condenses B. The nuclear envelope dissolves C. The chromosomes double in number D. The cell membrane pinches inward to divide the cytoplasm

2. Mitosis and meiosis are processes by which animal and plant cells divide. Which statement best describes a difference between mitosis and meiosis? A. Meiosis is a multi step process B. Mitosis occurs only in eukaryotic cells C. Meiosis is used in the repair of an organism D. Mitosis produces genetically identical daughter cells

3. What might happen if cytokinesis was omitted from the cell cycle A. The daughter cells would die B. The cell would lose its mitochondria C. The daughter cells would not have nuclei D. The cell would not divide into two daughter cell

4. If the total number of chromosomes in a cell is 6, then after mitosis there will be A. 6 chromosomes in each daughter cell B. 3 chromosomes in each daughter cell C. 12 chromosomes in each daughter cell D. 2 chromosomes in each daughter cell, one from each parent

A. 6 chromosomes in each daughter cell

5. If the total number of chromosomes in a cell is 6, then after meiosis there will be A. 6 chromosomes in each daughter cell B. 3 chromosomes in each daughter cell C. 12 chromosomes in each daughter cell D. 2 chromosomes in each daughter cell, one from each parent

B. 3 chromosomes in each daughter cell

6. In meiotic cell division, which phase is not repeated A. Interphase B. Prophase C. Metaphase D. Cytokinesis

A. Interphase

7. Using 3 of the boxes on the diagram above correctly label fertilization, meiosis and mitosis.

Mitosis Meiosis Fertilization

8. Which of the following increases genetic variation during meiosis? A. Spindle fiber formation B. Crossing over C. Condensing of chromatin into chromosomes D. Centromere formation

B. Crossing over

9. In terms of chromosome number why is meiosis (instead of mitosis) used to produce gametes?

Meiosis reduces the chromosome number by half so that each gamete is haploid (n) in terms of chromosome number. Thus, when fertilization occurs the resulting zygote will have the correct diploid (2n) number of chromosomes.

10. Contrast cytokinesis in animal and plant cells.

Animal Cells – cleavage furrow, flexible membrane, cells completely split Plant Cells – cell plate, rigid cell wall, cells remain connected