Chapter 12
Cell Division / Mitosis
Vocabulary: gene, cell division, chromosomes, somatic cells, gametes, chromatin, sister chromatids, centromere, mitosis, cytokinesis, meiosis, mitotic phase, interphase, centrosome, aster, kinetochore, cleavage furrow, cell plate, mitotic spindle, binary fission, transformation, benign tumor, malignant tumor, metastasis
Objectives:
After attending lectures and studying the chapter, the student should be able to:
1. Define gene as it relates to the genetic material in a cell.
2. Describe the composition of the genetic material in bacteria, in archaea, and in eukaryotic cells.
3. State the location of the genetic material in prokaryotic and eukaryotic cells.
4. Distinguish between the structure of the genetic material as chromatin and as
chromosomes.
5. Distinguish between the function of the genetic material as chromatin and as
chromosomes.
6. Relating to eukaryotic cells:
a. Describe the centromere region in the genetic material.
b. State the role of cohesins in duplicated genetic material.
c. Describe the sister chromatids of a duplicated chromosome.
d. State the role of the kinetochores on the chromatids at the centromere of a duplicated
chromosome.
e. Describe spindle fibers and state their role in the separation of chromosomes during eukaryotic cell division.
f. Describe the role of centrosomes in the formation of the spindle apparatus.
g. Distinguish between a gene and an allele.
h. Describe homologous chromosomes.
i. Distinguish between an individual's genome and karyotype.
j. State the number of chromosomes in human haploid cells and in human diploid cells.
k. State which cells in humans are haploid, which cells are diploid, and which cells are neither.
7. State the two major parts of the cell cycle.
8. Describe the differences of growth characteristics between a cancerous (transformed) cell and a normal cell.
8. Relating to the prokaryotic cell cycle:
a. State the number of chromosomes in a prokaryotic cell.
b. State the cellular activities that occur during interphase.
c. Show the process of binary fission that is prokaryotic cell division.
9. Relating to the eukaryotic cell cycle:
a. Distinguish between interphase and cell division.
b. Distinguish between the G1, S, and G2 phases of interphase.
c. Define karyokinesis and cytokinesis.
d. State the two types of karyokinesis.
e. Distinguish between the M and C phases of cell division.
f. State when in the cell cycle duplication of the genetic material occurs.
10. Relating to cell division involving mitosis (mitosis + cytokinesis):
a. Define mitosis.
b. Explain why mitosis is sometimes considered "duplication division".
c. State what 1 human diploid cell becomes after mitosis plus cytokinesis.
d. State the reason humans undergo cell division involving mitosis.
e. State which cells in humans undergo cell division involving mitosis.
f. Be able to describe, draw, and recognize the 4 stages of mitosis.
g. Describe the cleavage-furrow process of cytokinesis in animal cells.
h. Describe the cell-plate process of cytokinesis in plant cells.
| 1285954044 | Cell Cycle | An ordered sequence of events in the life of a cell |  | 1 |
| 1285954045 | Mitosis | A process of nuclear division in eukaryotic cells conventionally divided into five stages: prophase, prometaphase, metaphase, anaphase, and telophase. Mitosis conserves chromosome number by allocating replicated chromosomes equally to each of the daughter nuclei. |  | 2 |
| 1285954046 | Prophase | The first stage of mitosis, in which the chromatin condenses into discrete chromosomes visible with a light microscope, the mitotic spindle begins to form, and the nucleolus disappears but the nucleus remains intact. |  | 3 |
| 1285954047 | Prometaphase | The second stage of mitosis, in which the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the chromosomes. |  | 4 |
| 1285954048 | Metaphase | The third stage of mitosis, in which the spindle is complete and the chromosomes, attached to microtubules at their kinetochores, are all aligned at the metaphase plate. |  | 5 |
| 1285954049 | Anaphase | The fourth stage of mitosis, in which the chromatids of each chromosome have separated and the daughter chromosomes are moving to the poles of the cell. |  | 6 |
| 1285954050 | Telophase | The fifth and final stage of mitosis, in which daughter nuclei are forming and cytokinesis has typically begun. |  | 7 |
| 1285954051 | Cytokinesis | The division of the cytoplasm to form two separate daughter cells immediately after mitosis, meiosis I, or meiosis II. |  | 8 |
| 1285954052 | Chromosomes | A cellular structure carrying genetic material, found in the nucleus of eukaryotic cells. Each chromosome consists of one very long DNA molecule and associated proteins |  | 9 |
| 1285954053 | Gametes | A haploid reproductive cell, such as an egg or sperm. Gametes unite during sexual reproduction to produce a diploid zygote. |  | 10 |
| 1285954054 | Sister Chromatids | Two copies of a duplicated chromosome attached to each other by proteis at the centromere and sometimes, along the arms. While joined, two sister chromatids make up one chromosome. Chromatids are eventually separated during mitosis or meiosis II |  | 11 |
| 1285954055 | Centromere | In a duplicated chromosome, the region on each sister chromatid where they are most closely attached to each other by proteins that bind to specific DNA sequences; this close attachment causes a constriction in the condensed chromosome. (An uncondensed, unduplicated chromosome has a single centromere, identified by its DNA sequence.) |  | 12 |
| 1285954057 | interphase | The period in the cell cycle when the cell is not dividing. During interphase, cellular metabolic activity is high, chromosomes and organelles are duplicated, and cell size may increase. Interphase often accounts for about 90% of the cell cycle. |  | 13 |
| 1285954059 | mitotic spindle | An assemblage of microtubules and associated proteins that is involved in the movement of chromosomes during mitosis. |  | 14 |
| 1285954061 | somatic cell | Any cell in a multicellular organism except a sperm or egg or their precursors. | 15 | |
| 1285954063 | asexual reproduction | A type of reproduction involving only one parent that produces genetically identical offspring by budding or by the division of a single cell or the entire organism into two or more parts. | 16 | |
| 1285954065 | sexual reproduction | A type of reproduction in which two parents give rise to offspring that have unique combinations of genes inherited from the gametes of the two parents. | 17 | |
| 1285954067 | G1 Phase | The first gap, or growth phase, of the cell cycle, consisting of the portion of interphase before DNA synthesis begins. | 18 | |
| 1285954069 | S Phase | The synthesis phase of the cell cycle; the portion of interphase during which DNA is replicated. | 19 | |
| 1285954071 | G2 Phase | The second gap, or growth phase, of the cell cycle, consisting of the portion of interphase after DNA synthesis occurs. | 20 | |
| 1285954072 | M Phase | the phase of the cell cycle that includes mitosis and cytokinesis | 21 | |
| 1285954075 | Interphase | Cell grows, performs its normal functions, and replicates DNA; consists of G1, S, and G2 phases | 22 | |
| 1285954076 | Mitosis | Stage in the Cell Division Cycle in which the nucleus divides into nuclei containing the same number of chromosomes | 23 | |
| 1285954077 | Cytokinesis | Division of the cytoplasm during cell division | 24 |
