Name:  Peter Nelson    Subject: Biology I (Cell)    Period: 1st    Approximate Time: 50 minutes

Objectives:

The student will list the steps of mitosis with a brief definition of each stage (Biology, 3.g)

Materials:

Whiteboard, whiteboard markers, overhead, overhead markers, writing utensils.

Bell work:

Quiz on the steps of mitosis. Using your notes, list the steps of mitosis from beginning to end, add in as much information as you can about the steps.

A cell has 46 chromosomes and goes through mitosis. How many chromosomes are in the two daughter cells?

Set:

Yesterday you examined mitosis. But how are we made? How are we a little bit like our mothers and a little bit like our fathers? If we just divided by mitosis, we would look exactly like the person who made us. There would be no difference since our cells would be exactly the same as their cells. We are different because of meiosis. Who knows what meiosis is? What goes on during meiosis? Take a couple minutes to write down what you know about meiosis. Answer their questions and respond to their comments after about 3 minutes of think and write time. Establish that meiosis is sexual reproduction and that it is different than mitosis.  One cell becomes four cells. Today we will be examining meiosis and by the end you will be able to describe the steps of meiosis.

Procedure:

1. Review some of the stuff from yesterday (parts of a chromosome, cell cycle)

2. OK now we can get into meiosis. So remember that meiosis is one cell forming 4 cells. In this case the one cell is referred to as a diploid cell because it has the normal 46 chromosomes. How many pairs is that? That one cell makes four haploid cells that only have 23 chromosomes. Draw diagram on board so they can get a visual.

3. So if we were talking about cats, which have 38 chromosomes in their somatic cells, how many chromosomes would they have in their reproductive cells.  

4. Also draw a homologous chromosome so they have an idea of what it is as well as a tetrad. Be sure to label sister chromatid, and centromere.

4. Like mitosis, meiosis also goes through division, but in a different way.  Slip up on the overhead. And go over meiosis.

5. Tell them to list all of the phases of meiosis with a brief description, they can use notes but only when necessary.

6. Review, Prophase, Metaphase, Anaphase, Telophase-----> Prophase, Anaphase, Telophase.

Closure:

Good job today, review some of the key terms (centromere, homologous chromosomes, tetrad)  State objective and tell them that tomorrow will be a review of not only meiosis and mitosis but also everything else.

Assessment/Evaluation:

Objective: The student will list the steps of mitosis with a brief definition of each stage (Biology, 3.g)

Informal: The teacher will observe the students as they follow along with the information on meiosis.

Formal: The teacher will ask the students to list the phases of meiosis with a brief description. The list will be turned and and recorded in the grade book.

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