Cell Division: Mitosis and Meiosis Quiz

Grade 9 · Science · Quiz

Test your understanding of mitosis and meiosis with 10 challenging questions.

Questions

1. How many daughter cells result from one complete round of meiosis?

   1. 1
   2. 2
   3. 3
   4. 4
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   Answer: 4

   Meiosis undergoes two consecutive divisions (Meiosis I and II) starting with one diploid cell, producing four haploid daughter cells (gametes).

2. Mitosis occurs in reproductive cells (gonads) to produce gametes.

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   Answer: False

   Mitosis occurs in somatic (body) cells for growth, repair, and asexual reproduction. Meiosis occurs in the gonads (testes and ovaries) to produce gametes.

3. Chromosomes align at the cell's equator during ___.

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   Answer: metaphase

   In metaphase (the middle), chromosomes are maximally condensed and arranged along the metaphase plate. The mnemonic 'Metaphase = Middle' is helpful.

4. A cell with the diploid number 2n = 46 undergoes meiosis. How many chromosomes do the resulting cells have?

   1. 46
   2. 23
   3. 92
   4. 12
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   Answer: 23

   Meiosis halves the chromosome count: 46 ÷ 2 = 23. These 23-chromosome haploid cells are the gametes. Fertilization restores 46 by combining two gametes.

5. Crossing over during meiosis results in:

   1. Fewer chromosomes
   2. Genetic diversity in offspring
   3. Identical daughter cells
   4. DNA damage
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   Answer: Genetic diversity in offspring

   Crossing over shuffles genetic material between homologous chromosomes, producing new combinations of alleles. This is a primary source of genetic variation within a species.

6. During anaphase of mitosis, sister chromatids are pulled to opposite poles of the cell.

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   Answer: True

   In anaphase, the protein holding sister chromatids together breaks down and the spindle fibers shorten, pulling each chromatid (now a separate chromosome) to opposite poles.

7. Which best describes the relationship between meiosis and fertilization?

   1. Both reduce chromosome number
   2. Meiosis halves and fertilization restores chromosome number
   3. Fertilization occurs before meiosis
   4. Neither affects chromosome number
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   Answer: Meiosis halves and fertilization restores chromosome number

   This is the chromosome number lifecycle: diploid parent → meiosis → haploid gametes → fertilization → diploid zygote. Without this balance, chromosome numbers would double with every generation.

8. The division of the cytoplasm at the end of cell division is called ___.

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   Answer: cytokinesis

   Cytokinesis splits the cytoplasm and organelles between daughter cells. In animal cells this forms a cleavage furrow; in plant cells a cell plate forms between the new cells.

9. Cancer cells are characterized by:

   1. Arrested mitosis
   2. Uncontrolled mitotic cell division
   3. Increased meiosis
   4. Reduced chromosome count
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   Answer: Uncontrolled mitotic cell division

   Cancer results from mutations that disable cell cycle checkpoints, causing cells to divide uncontrollably and form tumors. Understanding mitosis is fundamental to understanding cancer biology.

10. During which phase of mitosis does the nuclear envelope break down and the spindle begin to form?

    1. Telophase
    2. Anaphase
    3. Metaphase
    4. Prophase
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    Answer: Prophase

    Prophase is the first and longest phase of mitosis: chromatin condenses into visible chromosomes, the nuclear envelope disintegrates, and spindle fibers begin to form from centrioles.

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