Meiosis
Study Questions

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  1. Which of the following is true concerning meiosis in humans? (check all that apply)
  1. At the end of meiosis, each egg or sperm contains 23 pairs of chromosomes.
  2. The chromosome number is reduced from the diploid state to the haploid state during anaphase I.
  3. A chromosome, at the end of metaphase II, consists of two sister chromatids attached by a centromere.
  4. Replication occurs between telophase I and prophase II.
  5. Crossing-over occurs during prophase I and again during prophase II.
  6. All maternal chromosomes are destined to move to one pole during anaphase I, while all paternal chromsomes will move to the opposite pole.

  1. Humans have (?) chromosomes.
  1. 23
  2. 46
  3. 4
  4. 92

  1. Which of the following are true concerning meiosis? (check all that apply) It:
  1. is intiated by sexual maturity
  2. produces four identical, haploid gametes
  3. produces four genetically distinct gametes
  4. increases genetic variation.

  1. Which of the following is not true concerning anaphase II of meiosis?
  1. sister chromatids separate and become chromosomes.
  2. paired homolgous chromosomes separate.
  3. the number of chromosomes is reduced by half.
  4. spindle fibers pull the chromosomes to opposite sides of the cell.

  1. During meiosis, the DNA replicates once, but divides twice.
TRUE
FALSE
  1. During anaphase I of meiosis, sister chromatids separate.
TRUE
FALSE
  1. Meiosis differs from mitosis in that meiotic products give rise to individuals which may vary from their parents and siblings while each individual produced by mitosis will be genetically identical to its parent.
TRUE
FALSE
  1. Crossing-over occurs in both prophase of mitosis and prophase I of meiosis.
TRUE
FALSE
  1. In meiosis, crossing-over is the only mechanism that increases genetic variation.
TRUE
FALSE
MATCHING:
(use lower case; incorrect responses will be replaced with a "?".)

10. prophase I a. 4 haploid gametes

11. metaphase I b. single chromosomes

12. anaphase I c. 1 --> 2

13. metaphase II d. homologous chromosomes

14. anaphase II e. crossing-over

15. telophase II f. 1 --> 4

16. meiosis g. haploid

17. mitosis h. chromatids
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