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SBI3U – Assigned Homework
Thursday, March 12, 2009 – Answer Sheet
Read Section 5.1:
Mitosis (pages 120-130)
Label the following Two Figures:
View the following web pages:
http://employees.csbsju.edu/hjakubowski/classes/ch331/dna/chromosome.gif
http://www.augustatech.edu/anatomy/chapter%203.html
Mitosis
Centriole
Label the following Figures of a cell replicating:
Stage: Prophase
Spindle
Fibre
Chromosome
Nuclear
Membrane
Disintegrati
ng
Stage: Interphase
Centriole
Aster – Spindle Fibres Forming
Chromatin
Nucleolus
Nuclear
Membrane
Cell Membrane
Centriole
Stage: Anaphase
Sister Chromatid
moving to the pole
Centriole
Stage: Metaphase
Centromere
New Cell
Membrane
Stage: Telophase / Cytokinesis
Cleavage
Furrow
Sister
Chromatid
Spindle Fibre
elongating cell
Stage: Telophase / Cytokinesis
Cell Type:
Animal
Spindle
Fibre
Reforming
Nuclear
Membrane
Cleavage
Furrow
Sister
Chromatid
– will
uncondense
Stage: Telophase / Cytokinesis
Cell Type:
Plant
Can see the new cell wall (cell plate) being
formed between the two new daughter cells
Read section 5.2:
Meiosis (pages 131-142)
Label the following Figures of a cell replicating [Meiosis I] and give a brief description of what is occurring
during that stage:
Stage: Prophase 1
- nuclear membrane is disintegrating
- centrioles are moving to poles
- homologous chromosomes pair
- synapsis (crossing over)
- nucleolus disintegrates
Stage: Telophase 1 / Cytokinesis 1
- nuclear membrane reforms
- chromosomes uncondensed
- cell membrane forms between cells –
Two unidentical cells
Stage: Interphase
- centrioles replicate
- DNA duplication
Stage: Metaphase 1 - homologous chromosomes
line up along metaphase plate
- spindle fibres attach to centromeres
Stage: Anaphase 1
- homologous chromosomes
move to opposite poles (still attached
at the centromere)
Label the following Figures of a cell replicating [Meiosis II] and give a brief description of what is occurring
during that stage:
Stage: Anaphase 2
opposite poles
-sister chromatids move to
Stage: Prophase 2
- nuclear membrane disintegrates
- centrioles move to opposite poles
Stage: Telophase 2 / Cytokinesis 2
Stage: Metaphase 2
- nuclear membrane reforms
- sister chromatids uncondensed
- new cell membrane formed between cells
- cells are haploid
- chromosmes line up along metaphase plate
Label the
following
Figure:
Crossing Over
Centromere
Homologous Chromosome
Tetrad
Homologous Chromosome
Sister Chromatids
Handouts:
The Cell Cycle
A Diagrammatic Comparison of Mitosis and Meiosis
Mistakes in Meiosis
Chromosomes Number Sheet