BIOL106 - Mitosis,.In the cell nucleus drawn, how many chromosomes

BIOL 106: Lab Assignment 6

Cell Division - Mitosis and Meiosis

Watch the video at: https://youtu.be/zGVBAHAsjJM. While you are viewing, answer the following questions. They are given in the order they will be found on the video.

Mitosis:

1.In the cell nucleus drawn, how many chromosomes are present?

2. How many of these chromosomes come from the mother and how many from the father of this “individual?”

3. If this nucleus was going to accurately display all the chromosomes in a human cell, how many chromosomes would have to be in the nucleus?

4. What is the goal of mitosis?

5. After the DNA is finished making a copy of itself, the chromosomes are in the shape of what letter of the alphabet – I or X?

6. After division of the nucleus, the chromosomes are in the shape of what letter of the alphabet – I or X?

Meiosis:

1. What do the chromosomes do in meiosis when they line up that is different from mitosis?

2. Does the DNA make a copy of itself again before the second division?

3. How many new nuclei come from the original nucleus when meiosis is complete?

4. How many chromosomes end up in each nucleus?

5. How many chromosomes were in the original nucleus?

6. How many of the 4 nuclei will become sperm?

7. How many of the 4 nuclei will become “the chosen” egg?

 8. Why is it important to cut the DNA in half before a sperm fertilizes an egg?

9. Will the fertilized egg grow by mitosis or meiosis?