EXAMINING MITOSIS AND MEIOSISLESSON 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!

AGRICULTURE, FOOD AND NATURAL RESOURCE STANDARDS ADDRESSED!

BS.02.03. Apply standard operating procedures for the safe handling of biological an chemical materials in a laboratory.Sample Measurement: The following sample measurement strands are provided to guide the development of measurable activities (at different levels of proficiency) to assess students’ attainment of knowledge and skills related to the above performance indicator. The topics represented by each strand are not all-encompassing.BS.02.03.01.a. Classify and document basic aseptic techniques in the laboratory.

• 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•Metaphase• 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!