cell reproduction i. introduction a. history. 1. r. r. brown, 1840’s, showed the existence of the...
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Cell Reproduction
I. Introduction
A. History
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1. R. Brown, 1840’s, showed the existence of the nucleus or “brain of the cell”
2. W. Fleming 1860’s, dark staining threads appeared to “dance” in nucleus before new cells formed, outlined the steps of mitosis
3. A. Weismann in 1887 proposed meiosis for sex cells
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II. StrategiesA.
Prokaryotes
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1. Binary Fission
or by
2. Endospore FormationFigure
12.11
Figure 27.9
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B. Eukaryotes
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1. Asexual by mitosis
a. Animals
Advantage
Disadvantagei.
Fission
Figure 27.9
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ii. Budding
Figure 13.2
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iii. Fragmenting
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b. Plants do runners, spore formation, or buddingc. Fungi do budding or spore formationd. Protists are just weird
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1. Sexual by mitosisAdvanta
geDisadvantagea. Plants = alternation of
generations
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b. Fungi same strategy as plantsc. Protists again weirdd. Animals
i. Parthenogenesis
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ii. Hermaphrodite
Figure 46.7
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iii. Sequential Hermaphrodite
Figure 46.4
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iv. Monoecious vs. Dioecious
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v. Polygyny vs. Polyandry
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III. Cell CycleA.
DefinitionB. Stages
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Figure 12.5
1. Interphase
a. Gap1
(G1)b. S c. Gap2
(G2)
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Figure 12.5
2. Divisiona. Mitosis or Meiosis
b. Cytokinesis
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C. Controls
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What could be a signal?
1. External
a. Hormones
Figure 12.17
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b. Contact Inhibition
Figure 12.18
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2. Internal
Figure 12.14
a. Biological Clock
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b. Cyclin & Kinases
Figure 12.15
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D. Cancer
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1. Classificationa. Benign
Figure 12.19
b. Malignant
c. Metastatic
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1. Classification
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2. Typesa. omas
Oral Squamous cell
Melanoma
Glioma
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IV. MitosisA. DefinitionB. Phases
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1. Prophase
a. Condense Chromosomes
Figure 12.4
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1. Prophase
b. Dismantle Nuclear Membrane
Figure 12.6
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1. Prophase
c. Build Spindle Fibers
Figure 12.6
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2. Metaphase
a. Line Up Sisters
Figure 12.6
Figure 12.7
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3. Anaphase a. Separate
Sisters
Figure 12.6
Figure 12.8
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4. Telophase a. Reverse
Prophase
Figure 12.6
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V. CytokinesisA.
DefinitionB. Strategies
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1. Animals a.
Cleavage Furrow
a. Cell Plate
Figure 12.9
2. Plants
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VI. MeiosisA. DefinitionB. Terms
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1. Karyotype
Figure 13.3
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2. Homologous Chromosomes Figure
13.4
a. Diploidb. Haploid
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C. Phases
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Figure 13.8
1. Meiosis I
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2. Meiosis II
Figure 13.8
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VII. Comparison
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Figure 13.9
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VIII. Variation from MeiosisA. Independent
Assortment
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Figure 13.10
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B. Crossing Over
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Figure 13.11
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C. Random Fertilization
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IX. Problems from MeiosisA.
Nondisjunction
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1. Whole chromosome
Figure 15.12a
a. Anaphase I
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Figure 15.12b
b. Anaphase II
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B. Chromosomal Disruptions
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1. Occurs when
2. Good or Bad?
Figure 15.14
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Choice is a gift, choose wisely.