Objective: Today we will continue to model the steps of mitosis in the form of a flip book Materials Agenda Notebook Pen/Pencil Packet Cell Book /23/2015- NO GUM PLEASE! Agenda Daily question Mitosis PPT Notes Flip book Brain pop Daily Question: What is meiosis?

Mitosis: If a cell wants to make a duplicate of itself, it first must copy its DNA (part of a chromosome). If a cell wants to make a duplicate of itself, it first must copy its DNA (part of a chromosome). The copies then must be separated & sorted into two sides of the cell. The copies then must be separated & sorted into two sides of the cell. The cell then splits in two. Part of each parent is carried to the two new cells. The cell then splits in two. Part of each parent is carried to the two new cells. Results in cells such as internal organs, skin, bones, blood, etc. Results in cells such as internal organs, skin, bones, blood, etc.

Meiosis: As in mitosis, if a cell wants to make a duplicate of itself, it first must copy its DNA (part of a chromosome). As in mitosis, if a cell wants to make a duplicate of itself, it first must copy its DNA (part of a chromosome). Results in reproductive cells (sperm, eggs, etc). Results in reproductive cells (sperm, eggs, etc). Part of each parent is carried to the four new cells. Part of each parent is carried to the four new cells. The problem is this: some organisms have sex with other organisms – that is, they combine their genes together (creating genetic diversity). The problem is this: some organisms have sex with other organisms – that is, they combine their genes together (creating genetic diversity).

This may you remember these terms: MITosis takes the cell and Makes It Two (diploid) MITosis takes the cell and Makes It Two (diploid) Meiosis has to do with sex Meiosis has to do with sex From the cell’s point of view: From the cell’s point of view: mITosis results in Identical Twins mITosis results in Identical Twins mEioSis results in Egg and Sperm (haploid) mEioSis results in Egg and Sperm (haploid) Clyde Freeman Herreid – Dept. of Biological Sciences: Buffalo State Univ. of New York

Meiosis Meiosis animation: Meiosis animation:

Vocabulary Diploid- Contain the exact same genetic material as the parent (Mitosis)-2n Diploid- Contain the exact same genetic material as the parent (Mitosis)-2n Haploid-Contain only half of the genetic material of the parent cell (Meiosis)-1n Haploid-Contain only half of the genetic material of the parent cell (Meiosis)-1n Meiosis-a special kind of cell division that produces haploid (1n) cells. Goes through two divisions Meiosis 1 and Meiosis 2. Meiosis-a special kind of cell division that produces haploid (1n) cells. Goes through two divisions Meiosis 1 and Meiosis 2.

Vocab part 2 Asexual Reproduction- One organism produces one or more new organisms identical to itself and that live independently of it. Asexual Reproduction- One organism produces one or more new organisms identical to itself and that live independently of it. Binary Fission- is the form of asexual reproduction occurring in prokaryotes. Parent organism splits into two. Binary Fission- is the form of asexual reproduction occurring in prokaryotes. Parent organism splits into two. Regeneration- the process of new tissue growth at these sites. (loss of limb or wound-Starfish). Regeneration- the process of new tissue growth at these sites. (loss of limb or wound-Starfish).

Mitosis: Meiosis: Each resulting cell still has chromosomes from mom & dad

Meiosis Interphase Meiosis Interphase Meiosis is preceded by interphase. The chromosomes have not yet condensed.

Meiosis Interphase The chromosomes have replicated, and the chromatin begins to condense.

Meiosis Prophase I The chromosomes are completely condensed. In meiosis (unlike mitosis), the homologous chromosomes pair with one another

Meiosis Metaphase I The nuclear membrane dissolves and the homologous chromosomes attach to the spindle fibers. They are preparing to go to opposite poles. The nuclear membrane dissolves and the homologous chromosomes attach to the spindle fibers. They are preparing to go to opposite poles.

Meiosis Anaphase I The chromosomes move to opposite ends of the cell.

Meiosis Telophase I & Cytokinesis The cell begins to divide into two daughter cells. It is important to understand that each daughter cell can get any combination of maternal and paternal chromosomes.

Meiosis Prophase II The cell has divided into two daughter cells.

Meiosis Metaphase II As in Meiosis I, the chromosomes line up on the spindle fibers.

Meiosis Anaphase II The two cells each begin to divide. As in Meiosis I, the chromosomes move to opposite ends of each cell.

Telophase II & Cytokinesis With the formation of four cells, meiosis is over. Each of these prospective germ cells carries half the number of chromosomes of somatic cells.