Mitosis/Meosis
- Created by: Amber Manley
- Created on: 15-01-14 20:54
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- Mitosis/Meosis
- Cell cycle
- Interphase
- 23 hours
- G1 gap
- S phase (DNA synthesis)
- G2 gap
- M phase
- 1 hour
- Prophase
- prometaphase
- metaphase
- anaphase
- telophase
- cytokinesis
- Interphase
- Interphase
- cell grows - doubling protein content
- organelles double in size or number
- S Phase - DNA synthesised
- centrosome replicates
- G1 and G2 occur - checking cell is ready
- M phase
- prophase
- chromosomes condense
- mitotic spindle (microtubules and proteins) form
- centrosomes move apart
- protein complex forms at the centomere of chromosome
- prometaphase
- nuclear membrane breaks down
- microtubules access chromosomes
- kinetochore complex
- nuclear membrane breaks down
- metaphase
- chromosomes allign at equator
- sister chromatids attach to poles by kinetochore microtubules
- anaphase
- cohesive link between sister chromatids released
- kinetochore microtubules shorten
- centrosomes move apart
- sister chromatids pulled to poles
- Telophase
- chromatids reach poles
- new nuclear envelope forms from fragments
- contractile ring forms around equator
- two nuclei
- end of mitosis
- prophase
- cytokinesis
- ring contracts, forming two daughter cells
- DNA decondenses, cell returns to G1
- Cytoskeleton
- increased instability
- motor proteins involved
- nuclear lamina (intermediate filaments
- needs to disassemble prior
- actin involved in contractile ring
- microtubules
- kinetochore microtubules attach to chromosomes
- grow and shrink during prometa to find target
- motor proteins (fast and slow) pull chromsomes
- kinetochore microtubules shorten, pulling chromsomes to poles in ana
- Controlled
- 3 checks
- G1
- environment check
- growth factors
- nutrients
- cell size
- DNA damage
- environment check
- G2
- environment check (size)
- DNA damage
- replication complete
- Meta-ana
- chromosomes attached
- G1
- 3 checks
- Meosis
- half number of chromosomes
- gametes
- opportunity to mix traits
- cell division
- between pro 1 and meta 1
- leptotene
- condense
- zygotene
- chromosomes allign and are linked by synapses
- pachytene
- recombination
- diplotene
- synapses break down
- pairs linked at cross overs (chiasmata)
- diakinesis
- condensing maximum
- Cell cycle
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