Lecture 12 Basics: Cell cycle and mitosis

Lecture 12 Basics: Cell cycle and mitosis
Cell division
Responsible for:
Also results in the uncontrolled growth of:
The cell cycle
Vocabulary:
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Duplicated Chromosomes
Haploidy and diploidy
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Homologous vs sister chromatids
More Vocabulary
Condensation:
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Karyotype
13.3 Phases of Mitosis
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Kinetochores and spindle fibers
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Class Notes
The following diagram will help you track the movement of chromosomes through synthesis
and meiosis.
Stage
How many
Chromosomes
chromosomes? look like:
Cells in G1
How many
homologous
pairs?
46
How many
sister
chromatids?
Ploidy?
2n or n
0
2n
In G2
Metaphase
of mitosis
Daughter
cells
In groups, draw three cells with 2n = 6 in the following stages:
Metaphase
G1
G2
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Phosphodiester bonds are formed during:
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Which of the following does NOT occur during mitosis?
A. Replication of DNA
B. Separation of sister chromatids
C. Breakdown of the nuclear membrane
50
DNA Content
(arbitrary units)
The DNA content of nerve cells at G1, mature sperm, and
gut endothelial cells at G2 have been measured and
plotted on the graph below. Based on the data in the
graph, which DNA sample is the nerve cell?
A. Sample 1
B. Sample 2
C. Sample 3
40
30
20
10
0
1
2
3
Sample
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