The Purpose of Meiosis and Mitosis Bell work: Which one of Mr. Morgan’s parents does he look more like? Does he look identical to either one? Why?

1. What do you think the word “diploid” might mean? Let’s break the word apart. Di=Two Ploid=copies We use the word diploid to describe a cell that has two almost identical chromosomes. With the exception of sex cells, almost all of a human’s cells are diploid. We must have diploid cells to function. In regards to a human we must have a pair of chromosomes to function. With that in mind, what is something that is paired that you might use in your everyday life?

Example: The tongs of a tweezers Example: The tongs of a tweezers. There are two of them and they must be almost identical in order to function properly. Now, it’s your turn. Give me an example of something that is diploid. Be ready to share with the class

2. What do you think the word “haploid” means? Let’s break the word apart. Hapl=single Ploid=copies We use the word haploid to describe a cell that has only one chromosome. In its single, halved form it becomes called a chromatid. Haploid cells with their chromatids are found in human sex cells (sperm and egg cells). You started out as a combination of one haploid cell from your mom and one haploid cell from your dad.

In regards to a human, a haploid cell must join with another haploid cell to make a human. With that in mind, what is something that must be paired to make it functional? Example: A single shoe. A shoe must be paired with another one to make the shoes functional. Now it’s your turn. Give me an example of something that is haploid. Be ready to share it with the class.

3. What does a diploid cell look like? Write in your own words one thing you know about the word diploid. A diploid cell with one chromosome will look like: On your slates, draw what a diploid cell with 3 chromosomes would look like.

Diploid Cell With 3 Chromosomes 1 2

4. What does a haploid cell look like? Write in your own words one thing you know about the word haploid. A haploid cell with one chromatid will look like: On your slates, what would a haploid cell with 3 chromatids look like?

Haploid Cell With 3 Chromatids 1 2 3 On your slates, what would a triploid cell with one chromosome look like?

5. What do meiosis and mitosis look like? Mitosis: starts with a diploid cell and ends with 2 diploid cells.

Based on the following description, what does meiosis look like Based on the following description, what does meiosis look like? Hint: fill in the chart. In this case, consider the start cell to only have one chromosome. Meiosis: begins with one diploid cell and ends with 4 haploid cells.

6. What are the purposes of meiosis and mitosis? Keep that flow chart in mind as you watch the following video. Think about how meiosis and mitosis look relates to what their purpose is. Answer these questions. a.What is the purpose of mitosis? b.What is the purpose of meiosis? Video: http://www.youtube.com/watch?v=2aVnN4RePyI

In Class Assignment/Homework In class assignment: Looking at the flow chart for meiosis and mitosis, how do the purposes of each process relate to their end results. Write 4-5 sentences relating form to function for both meiosis and mitosis. *If you do not finish this in class, it will be done as homework and turned in tomorrow.