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Chromosomes and Cell Cycle Test Review
Chromosome Questions
1. Put the following in order from smallest to largest:
 Cell, Chromosome, Nucleus, DNA, human
DNA, Chromosome, Nucleus, Cell, Human
2. What is a centromere?
The center of the chromosomes –Holds two chromatids together. Also where spindle fibers connect to the
chromosomes.
3. How many pairs of chromosomes do humans have?
23 pairs – 46 chromosomes
4. What’s the difference between Chromatid and Chromatin?
Chromatin (thin strand dna) – Chromatid – 2 chromatins
5. Draw a Chromosome and Label a chromatid and centromere:
chromatid
X
centromere
Mitosis-Cell Division
6. Name the Steps of the entire cell cycle in order – Including all 3 stages of interphase, all 4 stages of
mitosis, cytokensis.
{Interphase} - G1-S-G2, {Mitosis}-Prophase, Metaphase, Anaphase, Telophase – {Cytokenisis}
7. What is a cell doing during interphase? (be sure to name the one thing that only happens during
interphase)
Growing and DNA replication.
8. Interphase has 3 stages Describe all 3.



G1-Where the cell determines if the cell is going to replicate
S-DNA replication
G2-Checks DNA replication
9. Draw interphase.
10. What happens during prophase?
Chromosomes thicken- you can see them
11. Draw prophase.
12. What happens during metaphase?
Chromosomes line up down the MIDDLE
13. Draw metaphase.
1
14. What happens during anaphase?
Chromosomes separate and move AWAY
15. Draw anaphase.
16. What happens during telophase?
Two nuclei- cells begin to split
17. Draw telophase.
18. What happens during cytokensis?
Two new daughter cells that are identical to the parent
19. Draw cytokensis.
20. What do the centrioles do during mitosis?
Where the spindle come from
21. If an animal has 40 chromosomes in each of its somatic cells and divides in mitosis how many
chromosomes will the new (daughter) cells have?
40 ----Identical to the parent cell
22. How is the cell cycle different in a plant than in an animal? (think about cytokensis)
Animal cells cleavage furrow, plant cells form a cell plate/wall
23. What is purpose of mitosis? - Name 3 things that Mitosis controls in your body.
Reproduce, repair, growth
24. A mutated cell that is undergoing constant, uncontrolled cell growth is considered thiscancer
25. Mitosis produces how many new cells?
2
26. If a cell has 40 chromosomes, how many chromosomes will each new cell have after MITOSIS?
40 chromosomes – Identical to parent cell
27. What is a somatic cell?
Body cell – hair, skin, lungs, heart ----Everything BUT Sex cells (egg/sperm)
28. 90% of a cell life span is spent in one stage?
Interphase
29. After a cell completes Cytokenisis, What happens next?
Cell starts over again in interphase
30. If we compared the original cell to the 2 new daughter cells at the end of mitosis. What observations could
be made?
Exactly identical
31. The nuclear envelope disappears in what stage?
Prophase
2
32. Label the following stages and number them in the order they take place from 1-6.
4-_Anaphase___
6-_Cytokensis
2-Prophase
3-Metaphase
3
5- Telophase
1-interphase