Biology  by Bradford
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4.5 Cell Cycle: revision map

The subtopic in the middle and five tasks round it: label two diagrams, complete a table, put a process in order and fill 11 gaps. Every box rests on a learning objective of the topic in the AP Biology course and exam description. Type into the blanks and check them, or print it on A4, Letter or A3 with an answer key.

Unit 4 practice questionsThe whole Unit 4 map

Topic 4.5

Cell Cycle

AP Biology ยท Unit 4 Cell Communication and Cell CycleName

4.5.BStages of mitosis

1234
  1. 1
  2. 2
  3. 3
  4. 4

4.5.A, 4.5.BCounting DNA

Before S phase a cell has one copy of each chromosome. After S phase it has as much DNA, but the chromosome number is the same, because the copies stay attached as sister chromatids. At anaphase the chromatids separate, and each new cell receives one full set, so daughter cells are genetically identical to the parent. Mitosis is used for growth, repair and, in many organisms, asexual reproduction.

4.5.APhases

PhaseWhat happens
G1the cell grows and carries out its normal functions
DNA is replicated, so each chromosome has two sister chromatids
G2the cell grows more and prepares to divide; checks the copied DNA
the nucleus divides, then the cytoplasm in cytokinesis, to give two identical cells
Topic 4.5Cell Cycle

4.5.AThe cell cycle

1234
  1. 1
  2. 2
  3. 3
  4. 4

4.5.BMitosis in order

Number the steps in order.

  1. Metaphase: chromosomes line up along the center of the cell.
  2. Telophase: nuclei re-form round each set of chromosomes.
  3. Cytokinesis: the cytoplasm divides.
  4. Anaphase: sister chromatids are pulled to opposite poles.
  5. Prophase: chromosomes condense and the spindle starts to form.
Word bank anaphaseG1 phaseG2 phasemetaphaseMitosismitosisprophaseSS phasetelophasetwice

Answer key

Every box on the sheet with its gaps filled in, as the subtopic reads in full.

  1. LabelThe cell cycle

    1. G1 phase
    2. S phase
    3. G2 phase
    4. mitosis

  2. LabelStages of mitosis

    1. prophase
    2. metaphase
    3. anaphase
    4. telophase

  3. TablePhases

    PhaseWhat happens
    G1the cell grows and carries out its normal functions
    SDNA is replicated, so each chromosome has two sister chromatids
    G2the cell grows more and prepares to divide; checks the copied DNA
    Mitosisthe nucleus divides, then the cytoplasm in cytokinesis, to give two identical cells

  4. OrderMitosis in order

    1. Prophase: chromosomes condense and the spindle starts to form.
    2. Metaphase: chromosomes line up along the center of the cell.
    3. Anaphase: sister chromatids are pulled to opposite poles.
    4. Telophase: nuclei re-form round each set of chromosomes.
    5. Cytokinesis: the cytoplasm divides.

  5. GapsCounting DNA

    Before S phase a cell has one copy of each chromosome. After S phase it has twice as much DNA, but the chromosome number is the same, because the copies stay attached as sister chromatids. At anaphase the chromatids separate, and each new cell receives one full set, so daughter cells are genetically identical to the parent. Mitosis is used for growth, repair and, in many organisms, asexual reproduction.