Biology: Life on Earth
Audesirk & Audesirk
Prentice-Hall, Inc.

Chapter 12: Self-Quiz

  1. Which statement is most correct?
    1. All mutations are harmful.
    2. Mitosis and meiosis both add to genetic diversity.
    3. Crossing over helps each gamete get a different set of genes in meiosis.
    4. Mitosis always makes diploid daughter cells while meiosis always produces gametes.
    5. The only haploid cells are gametes.

  2. When does crossing over occur?
    1. during translation
    2. during fertilization
    3. during mitosis
    4. during mutation
    5. when homologues have aligned and replicated

  3. When do homologous chromosomes pair up?
    1. only in mitosis
    2. only in meiosis I
    3. only in meiosis II
    4. in both mitosis and meiosis
    5. in neither mitosis nor meiosis

  4. Two homologues
    1. would be represented by maternal vs. paternal copies of the same chromosome
    2. would represent the two single strands of DNA that wrap into the double helix
    3. are still joined at the centromere between meiosis I and meiosis II
    4. are both present in haploid gametes
    5. none of the above

  5. Curiously, there is no crossing over of any chromosome in the male fruit fly Drosophila, which has 4 pairs of chromosomes. How many different combinations of maternal vs. paternal chromosomes are possible in a male fruit fly's sperm?
    1. 2
    2. 4
    3. 8
    4. 16
    5. many more than the above

  6. During alternation of generations
    1. The zygote produces a gametophyte.
    2. The sporophyte is haploid.
    3. Spores give rise to gametophytes.
    4. Sporophytes produce sperm and eggs.
    5. The gametophyte is diploid.

  7. Which of the following is the definition of meiosis?
    1. is a purely random division of chromosomes
    2. doubles the number of chromosomes
    3. reduces the number of chromosomes by half
    4. does not change the number of chromosomes
    5. allows chromosomes to split in half

  8. The pairing up of homologous chromosomes occurs during
    1. mitosis
    2. meiosis I
    3. meiosis II
    4. mitosis and meiosis II
    5. protein synthesis

  9. Which of the following takes place in meiosis I but not in meiosis II?
    1. Diploid daughter cells are produced.
    2. Chromosomes without chromatids line up at the equator.
    3. Centromeres divide.
    4. Joining of homologous chromosomes occurs.
    5. The spindle apparatus forms.

  10. Meiosis II's main function is to
    1. separate sister chromatids during anaphase
    2. reduce the number of gametes by half
    3. reduce the number of chromosomes by half
    4. increase genetic variability by crossing over
    5. to allow homologous chromosomes to pair up

  11. Each ova cell of a horse has 32 chromosomes. How many chromosomes are there in each of the horse's body cells?
    1. 16
    2. 32
    3. 16 pairs
    4. either 16 or 64, depending on the cell type
    5. 64

  12. Organisms exhibiting an alternation of generations life cycle
    1. have multicellular diploid forms and multicellular haploid forms
    2. produce gametes by mitosis
    3. produce both diploid and haploid cells be meiosis
    4. produce gametes directly by meiosis
    5. Both choices a and b are correct.

  13. All of the following are true except:
    1. Mutations in DNA are the ultimate source of genetic variability.
    2. The effects of a mutation depend on the nature of the mutation, the organism in which it occurs, and the environment in which the organism lives.
    3. Genetic exchange does not combine useful mutations.
    4. Eukaryotic organisms use a specialized cell division called meiosis to effect genetic exchange between individuals.
    5. Permanent diploidy protects against some of the harmful effects of mutations.

      

Designed in cooperation with Andrew Stull and Steven Brunasso.

Last Update - July 25, 1997

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