Cell Cycle. Cell Cycle. Describe what occurs during each stage of the cell cycle. Identfy the 5 stages of the cell cycle.

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1 1 2 Identfy the 5 stages of the cell cycle. Describe what occurs during each stage of the cell cycle. 3 4 What stages of the cell cycle are included in interphase? What is cytokinesis?

2 5 6 Predict what might happen of the cell never underwent cytokinesis? What is the relaxed form a DNA found in the nucleus? 7 8 In preparaton for the cell to undergo mitosis, the chromatn condenses into what type of structure? Defne mitosis.

3 9 List the 4 stages of mitosis in the correct sequence. 10 Describe the events that take place during prophase Identfy the stage of mitosis in which the cell s chromosomes line up in the middle of the cell. Draw a chromosome. Label the sister chromatds and the centromere.

4 13 Describe the events that take place during anaphase. 14 Describe the events that take place during telophase Describe the diference between plant and animal cells during cytokinesis. What actvites are taking place in the cell during interphase?

5 17 Explain the relatonship between DNA, a chromosome, and chromatn. 18 While looking through a microscope, you see a cleavage furrow develop. What stage is this cell in, and what type of cell is it? How does mitosis and meiosis difer? Describe how metaphase in mitosis difers from metaphase I in meiosis.

6 21 Defne crossing over. When does it occur? 22 Describe each phase during meiosis I Compare meiosis I and meiosis II. Predict what might happen if the sister chromatds did not separate during anaphase II.

7 25 Infer how meiosis increases genetc variaton. 26 Infer why mitosis does not increase genetc variaton What stage of mitosis is depicted? What stage of meiosis is depicted?

8 FINISHED. The following pages contain the answers to these questions.

9 2 G1 cell grows S DNA synthesis G2 organelles replicated M- Mitosis C - Cytokinesis 1 G1 S G2 M C 4 3 Division of cytoplasm G1 S G2

10 6 5 Chromatn The cell would have multple nuclei. 8 7 Process by which the cell s genetc material separates into 2 nuclei before cytokinesis. Chromosome

11 10 Nuclear membrane dissolves Chromosomes condense Spindle apparatus forms 9 Prophase Metaphase Anaphase Telophase Metaphase

12 14 13 Nuclear envelop reforms Chromosomes decondense The sister chromatds are separated and moved to opposite ends of the cell Growing Synthesizing DNA Replicatng organelles Plant cell plate forms diving the daughter cells Animal cleavage furrow forms dividing the daughter cells

13 18 17 Cytokinesis Animal Cell A chromosome and chromatn are composed of DNA. The chromosome is the condensed version of chromatn Metaphase sister chromatds line up on metaphase plate Metaphase I homologous chromosomes line up on the metaphase plate Mitosis Meiosis 4 phases 8 phases 2 daughter cells 4 daughter cells Identcal daughter cells Body cells Diferent daughter cells Sex cells

14 22 PI homologous chromosomes pair; crossing over MI homologous chromosomes line up on the metaphase plate AI homologous chromosomes separate TI 2 nuclei form; cells split 21 Chromosomal segments are exchanged between homologous chromosomes. Crossing over occurs during prophase I One daughter cell would have an extra chromosome. One daughter cell would be missing a chromosome. Same events take place in each Meiosis I separates homologous chromosome Meiosis II separates sister chromatds

15 26 The daughter cells are identcal to the parent cells, thus providing no genetc variaton. 25 Crossing over provides genetc variaton During fertlizaton the gametes randomly combine Anaphase I Metaphase