EXAMINING MITOSIS AND MEIOSIS LESSON C3-3

MS‐LS2‐4. Construct an argument supported by empirical evidence that changes to physical or biological components of an ecosystem affect populations. [Clarification Statement: Emphasis is on recognizing patterns in data and making warranted inferences about changes in populations, and on evaluating empirical evidence supporting arguments about changes to ecosystems.] RST.6‐8.1 Cite specific textual evidence to support analysis of science and technical texts. (MS-LS1-6),(MS-LS2-1),(MS-LS2-4) RST.6‐8.2 Determine the central ideas or conclusions of a text; provide an accurate summary of the text distinct from prior knowledge or opinions. 6.RP.A.3 Summarize numerical data sets in relation to their context. (MS-LS2-2) COMMON CORE- NEXT GENERATION STANDARDS TO BE ADDRESSED!

Define mitosis and discuss its importance. Explain each step of mitosis. Define meiosis and explain its importance. Explain each step of meiosis. BELL WORK!

Mitosis Chromosome Prophase Meaphase Anaphase Telophase Haploid TERMS!

Mitosis is a sequential process of cell division. This process is repeated over and over during the life of the organism. Mitosis is cell division for growth and repair. This process is continually occurring. MITOSIS

Interphase Prophase Metaphase Anaphase Telophase MITOSIS IS DIVIDED INTO FIVE PERIODS OR STEPS.

Interphase is the stage of chromosome replication. Prophase- chromosomes are first formed Metaphase chromosomes move to the middle of the cell. – These chromosomes line up along the equator of the cell. MITOSIS IS DIVIDED INTO FIVE PERIODS OR STEPS.

Interphase – The cell doubles its cytoplasm and synthesizes DNA.

Prophase – The first stage of mitosis, during which the chromosomes condense and become visible.

Metaphase – The second stage of cell division in which the duplicate chromosomes become aligned along the center of the cell.

Anaphase, chromosomes separate and move to opposite sides of the cell. – Shortening spindle fibers separate the chromosomes.

Telophase, nucleus reforms and a membrane appears between each mass of chromosomes. This newly formed membrane divides the cytoplasm. – Once this is completed, the two separate cells repeat the process.

Division of cells in the reproductive process. Haploid cells are the cells that are produced as a result of meiosis. These cells have only single chromosomes rather than the homologous or matching pair. MEIOSIS

These cells are known as gametes. Male gametes are called spermatozoa. Female gametes are known as ova. MEIOSIS

THE END!