Mitosis And Miosis Flashcards
4 stages of the eukaryotic cell cycle
-interphase
-G1 phase / G2 phase
-S phase
-M phase
G1 phase is?
Growth phase
M phase is…
Nucleus decides through mitosis; cytoplasm divides through cytokinesis
Interphase occurs…
Between two successful M phases
3 options in G1 phase;
-continue cell cycle and enter S phase
-stop cycle and entered G0 phase for undergoing differentiation
- become arrested in G1 may enter G0 phase or re-enter cell cycle
When does S phase start…
When DNA synthesis/ replication commences
3 things base pairing allows…
1-enables DNA replication
2- each strand to act as a template for producing complimentary strand
3-copy of genes produces before passing them on
G2 phase occurs…
After DNA replication
What is G2 phase?
Period of protein synthesis and rapid cell growth preparing cell for mitosis
Why may cells be checked at G2 checkpoint?
For any DNA damage within the chromosomes
What is mitosis ?
-replicated chromosomes are separated into new nuclei
-maintains total no. Of chromosomes by giving rise to genetically identical cells
What is the centrosome?
The co-ordinating centre for the cells microtubules
How does cell prepare to divide?
-tightly condensing it’s chromosomes
-initiating mitotic spindle formation
When does gene transcription cease and resume?
-Ceases during prophase
-Until late anaphase early G1 phase
What is mitosis-prometaphase?
-microtubules invade nuclear space
-phosphorylation of nuclear laminate cause the nuclear envelope to disintegrate into small membrane vesicles
