Download EXERCISE 14 MITOSIS

EXERCISE 14 MITOSIS
The Cell Cycle
Define: 1. cell cycle2. mitosis3. cytokinesisBased on fig.14.4 above, and the fact that a human cell growing in culture completes its
cell cycle in 22 hours, estimate how long each phase in this cycle takes.
G1SG2MitosisCytokinesisDescribe the main cell changes that occur during each of these phases below.
G1SG2MitosisCytokinesis-
Does the cell cycle have a beginning and an end? Explain.
STAGES AND EVENTS OF MITOSIS: Read page 150.
Define: 1. centromere2. centriole3. polar fibers4. mitotic spindle5. chromosome6. chromatidPROCEDURE 14.1. Events of Mitosis
1. If the nucleus of a cell has 10 chromosomes at the very beginning of interphase,how
many will it have during metaphase?
2. How many chromosomes will the cells have after mitosis is complete?
PROCEDURE 14.2. Simulated Chromosome Changes During Mitosis
1. Follow steps 1-12 in manual. THIS PROCEDURE IS OPTIONAL
2. Complete table 14.1 describing the events that happen during interphase & each
phase of mitosis. THIS PART IS NOT OPTIONAL.
PROCEDURE 14.3. Mitosis in Animal Cells
1. Follow steps 1-6 in manual.
2. Why would you chose an embryonic mass of cells, such as a whitefish embryo,
for procedure 14.3 to study the stages of mitosis?
3. Which stage of mitosis is occurring when cytokinesis begins?
PROCEDURE 14.4. Mitosis in Plant Cells
1. What is a cell plate?
2. Follow steps 1-4 in your manual.
3. Complete the diagram in fig. 14.7.
4. Why was a root tip used to see cells in mitosis?
5. How does cytokinesis differ in plant cells than in animal cells?
6. Locate a cell on your onion root tip slide that is in late telophase. What is the
volume of the 2 new cells being formed relative to a mature cell?
7. Define :
diploidtetraploid-
SUMMARY:
1. Interphase was, in the past, called the resting stage. Why was this description
used? Why is it inaccurate?
2. What term describes the chromosome number in cells before and after
cell division by mitosis?
3. What term describes the chromosome number at the end of interphase
and beginning of prophase?
4. Which cells in your body can reproduce by mitosis?
5. Which cells in your body cannot reproduce by mitosis and must be
produced by other cells?