Post on 21-Dec-2015
STAGES OF MITOSIS
Whitefish Mitosis
Key Structures: Nuclear Membrane, Chromosomes, Spindles, Cytoplasmic membrane
I P M
A T
Prometaphase
• Nuclear envelope breakdown
• Attachment of chromosomes to spindle apparatus
Metaphase
• Alignment of the chromosomes at the metaphase plate
• Rate-limiting step of mitosis!
Metaphase plateKinetochore microtubules
Spindle poles
Anaphase
Anaphase A• Sister chromatids
separate and move towards poles
• Kinetochore microtubules shorten
Anaphase B• Spindle poles move
apart• Cytokinesis begins
Question 2
This structure could be part of the a) Kinetochoreb) Centromerec) Microtubule
Organizing Center (MTOC)
d) Cleavage furrowe) Chromatid
Question 3
What characteristics would you expect to find in the cell at the pointer:
I. Spindle apparatusII. Nuclear envelopeIII. Contractile ringIV. Equatorial plate
a) I and II onlyb) I, II, and IVc) I and IVd) All