bio lab 156 lab 6
1. Why are spindle fibers important for mitosis? (5 points)
Spindle fibers work as a path for chromosomes to travel(Campbell, 2009).
2. State the four bases that make up DNA. (4 points)
a. (A)-Adenine
b. (G)-Guanine
c. (T)-Thymine
d. (C)-Cytosine (Campbell, 2009).
3. What are the two base pairs? (2 points)
a. AG
b. CT
4. Answer the following questions:
a. Define the term crossing over. (3 points)
The phase in meiosis where chromosomes exchange segments of genetic materials (Campbell, 2009).
b. Explain why crossing over is important in meiosis. (3 points)
Crossing over is the way that genes receive genetic traits from both of the parents.
5. What are the two main differences between mitosis and meiosis? (4 points)
a. Crossing over does not occur in mitosis
b. The number of cells exchanged is different and mitosis occurs in all organisms and meiosis only occurs in certain organisms and the number of cells (Campbell, 2009).
6. Answer the following questions:
a. Explain the difference between mitosis and cytokinesis. (3 points)
Firstly mitosis occurs before cytokinesis. Mitosis results in growth of cells and cytokinesis is for maintenance. Mitosis divides a cell’s nucleus and cytokinesis divides the cytoplasm (Campbell, 2009).
b. When does mitosis occur during the cell cycle? (1 point)
Throughout the whole cell cycle
c. When does cytokinesis occur during the cell cycle? (1 point)
Telophase
7. Explain the differences that occur during cytokinesis of plant and animal cells. (5 points)
In animal cells the cell is pinched creating a cleavage furrow that allows it to be split the cytoplasm. In plant cells the wall is too rigid so the plasma membrane and cell wall have to grow inward together in order to be split (Campbell, 2009).
8. Refer to the images below, labeled A through E. Each image details a stage of the cell cycle for a cell undergoing mitosis. Place the images in correct order by placing the letters in the correct sequence, according to the stages of mitosis. (5
Spindle fibers work as a path for chromosomes to travel(Campbell, 2009).
2. State the four bases that make up DNA. (4 points)
a. (A)-Adenine
b. (G)-Guanine
c. (T)-Thymine
d. (C)-Cytosine (Campbell, 2009).
3. What are the two base pairs? (2 points)
a. AG
b. CT
4. Answer the following questions:
a. Define the term crossing over. (3 points)
The phase in meiosis where chromosomes exchange segments of genetic materials (Campbell, 2009).
b. Explain why crossing over is important in meiosis. (3 points)
Crossing over is the way that genes receive genetic traits from both of the parents.
5. What are the two main differences between mitosis and meiosis? (4 points)
a. Crossing over does not occur in mitosis
b. The number of cells exchanged is different and mitosis occurs in all organisms and meiosis only occurs in certain organisms and the number of cells (Campbell, 2009).
6. Answer the following questions:
a. Explain the difference between mitosis and cytokinesis. (3 points)
Firstly mitosis occurs before cytokinesis. Mitosis results in growth of cells and cytokinesis is for maintenance. Mitosis divides a cell’s nucleus and cytokinesis divides the cytoplasm (Campbell, 2009).
b. When does mitosis occur during the cell cycle? (1 point)
Throughout the whole cell cycle
c. When does cytokinesis occur during the cell cycle? (1 point)
Telophase
7. Explain the differences that occur during cytokinesis of plant and animal cells. (5 points)
In animal cells the cell is pinched creating a cleavage furrow that allows it to be split the cytoplasm. In plant cells the wall is too rigid so the plasma membrane and cell wall have to grow inward together in order to be split (Campbell, 2009).
8. Refer to the images below, labeled A through E. Each image details a stage of the cell cycle for a cell undergoing mitosis. Place the images in correct order by placing the letters in the correct sequence, according to the stages of mitosis. (5